One of the biggest challenges with Windows 7 is getting software installed with UAC enabled and the user is not an local administrator.  I found a VB script a few years ago that helped assist with just that. This VB Script is a very powerful asset in any IT organization.  I utilize it as a shell for all VB Scripts I write. I wish I could remember the original author(s) to give credit where credit is due.  I believe I stumbled upon it through Google Searches and several random forum boards.  Trying and experimenting with as many possible solutions as I could find.

'---------------------------------------------
'Run a VB Script after forcing a UAC challenge
'2/10/2012 Trinity Rolling
'-------------------------------------------- 

bElevate = False
if WScript.Arguments.Count > 0 Then If WScript.Arguments(WScript.Arguments.Count-1) <> "|" then bElevate = True
if bElevate Or WScript.Arguments.Count = 0 Then ElevateUAC

'--------------------------------------------
'Insert the script you want to run with elevated privledges below
'--------------------------------------------

' Check the operating system
Function IsWindows7
 Set OSSet = GetObject("winmgmts:{impersonationLevel=impersonate}!//" _ 
 & "./root/cimv2").ExecQuery("select Caption from Win32_OperatingSystem") 
 For Each OS In OSSet 
 sOS = OS.Caption 
 Next 
 IsWindows7 = (InStr(1, sOS, "Windows 7", 1) + InStr(1, sOS, "Vista") > 0)
End Function

' Force a UAC challenge
Sub ElevateUAC
 if not isWindows7 then Exit Sub
 sParms = " |"
 If WScript.Arguments.Count > 0 Then
 For i = WScript.Arguments.Count-1 To 0 Step -1
 sParms = " " & WScript.Arguments(i) & sParms
 Next
 End If
 Set oShell = CreateObject("Shell.Application")
 oShell.ShellExecute "wscript.exe", WScript.ScriptFullName & sParms, , "runas", 1
 WScript.Quit
End Sub

Below is an example of the script used to deploy Microsoft Lync 2010 to Field Agents at their convienence.  Field Agents are a challenge as they may require VPN, low bandwidth, and short attention spam.

'---------------------------------------------
'Run a VB Script after forcing a UAC challenge
'2/10/2012 Trinity Rolling
'--------------------------------------------
bElevate = False
if WScript.Arguments.Count > 0 Then If WScript.Arguments(WScript.Arguments.Count-1) <> "|" then bElevate = True
if bElevate Or WScript.Arguments.Count = 0 Then ElevateUAC

' Check for Software Title
'This script outputs to a .tsv file a list of applications installed on the computer
'Output file is software.tsv
'Usage: cscript applications.vbs

'----------------------------------------
softwareTitle = "Microsoft Lync 2010" 'Change the software title you are looking for here.
softwareVersion = "4.0.7577.0" 'Change the software version you are looking for here.
InstallScript = "C:\Updates\LyncInstall.cmd"
strTargetFolder = "C:\Updates\"
strSourceFolder = "\\FileShare\DeploymentShare\Applications\Lync\i386\"
strInstallFile1 = "LyncSetup.exe"
strInstallFile2 = "" 'Uncomment the lines below (100-103) if used.
strInstallFile3 = "" 'Uncomment the lines below (104-107) if used.
strInstallFolder1 = "" 'Uncomment the lines below (108-111) if used.

'----------------------------------------

'Begin Script Execution

Set objShell = CreateObject("WScript.Shell")
objShell.Popup "We are now checking for existing versions. This notification will disappear once we have finished checking for existing versions. Please wait... ", 60, softwareTitle, 64
Set objFSO = CreateObject("Scripting.FileSystemObject")
Set objTextFile = objFSO.CreateTextFile("C:\WINDOWS\Temp\software.tsv", True)

strComputer = "."
Set objWMIService = GetObject("winmgmts:" _
& "{impersonationLevel=impersonate}!\\" & strComputer & "\root\cimv2")
Set colSoftware = objWMIService.ExecQuery _
("Select * from Win32_Product")

objTextFile.WriteLine "Caption" & vbtab & _
"Description" & vbtab & "Identifying Number" & vbtab & _
"Install Date" & vbtab & "Install Location" & vbtab & _
"Install State" & vbtab & "Name" & vbtab & _
"Package Cache" & vbtab & "SKU Number" & vbtab & "Vendor" & vbtab _
& "Version"

For Each objSoftware in colSoftware
objTextFile.WriteLine objSoftware.Caption & vbtab & _
objSoftware.Description & vbtab & _
objSoftware.IdentifyingNumber & vbtab & _
objSoftware.InstallDate2 & vbtab & _
objSoftware.InstallLocation & vbtab & _
objSoftware.InstallState & vbtab & _
objSoftware.Name & vbtab & _
objSoftware.PackageCache & vbtab & _
objSoftware.SKUNumber & vbtab & _
objSoftware.Vendor & vbtab & _
objSoftware.Version
Next

' This searches for a string of txt in a file

Dim FoundTitle 'as boolean
Dim FoundVersion 'as boolean
FoundTitle=false 'initialize it to false
FoundVersion=false 'initialize it to false
With createobject("Scripting.FileSystemObject")
on error resume next
FoundTitle = (InStr(1,.OpenTextFile("C:\WINDOWS\Temp\software.tsv",1,true,-2).ReadAll, softwareTitle,1) <> 0)
FoundVersion = (InStr(1,.OpenTextFile("C:\WINDOWS\Temp\software.tsv",1,true,-2).ReadAll, softwareVersion,1) <> 0)
on error goto 0
End With

'wscript.echo FoundIt

' If Software title is found run script
Const wshYes = 6
Const wshNo = 7
Const wshYesNoDialog = 4
Const wshQuestionMark = 32
Const wshWarningMark = 48
Const wshInformationMark = 64
Const FOF_CREATEPROGRESSDLG = &H0&

Set objShell = WScript.CreateObject("Wscript.Shell")
' If Software title is found
If FoundTitle and FoundVersion Then
objShell.Popup softwareVersion & " is already installed. No further action is needed on your part. Thank you", _
-1, softwareTitle, wshInformationMark
Else
' Begin File Copy
Set objShellApp = CreateObject("Shell.Application")
Set objFolder = objShellApp.NameSpace(strTargetFolder)
'---------------------------------------------------------------------------
If objFSO.fileExists(strTargetFolder + strInstallFile1) Then
Else
objFolder.CopyHere strSourceFolder + strInstallFile1, FOF_CREATEPROGRESSDLG 'Change the install file(s) location as needed.
End If
REM If objFSO.fileExists(strTargetFolder + strInstallFile2) Then 'Remove/Comment out if not used
REM Else
REM objFolder.CopyHere strSourceFolder + strInstallFile2, FOF_CREATEPROGRESSDLG
REM End If
REM If objFSO.fileExists(strTargetFolder + strInstallFile3) Then 'Remove/Comment out if not used
REM Else
REM objFolder.CopyHere strSourceFolder + strInstallFile3, FOF_CREATEPROGRESSDLG
REM End If
REM If objFSO.folderExists(strTargetFolder + strInstallFolder1) Then 'Remove/Comment out if not used
REM Else
REM objFolder.CopyHere strSourceFolder + strInstallFolder1, FOF_CREATEPROGRESSDLG
REM End If
'---------------------------------------------------------------------------
' Begin Install
intReturn = objShell.Popup("Do you want to begin the install of " & softwareTitle & " now?", _
-1, softwareTitle, wshYesNoDialog + wshQuestionMark)
If intReturn = wshYes Then
'---------------------------------------------------------------------------
objShell.Run(InstallScript), 0, True 'Change the install script location as needed.
'---------------------------------------------------------------------------
intReboot = objShell.Popup("Install Complete! Would you like to reboot now?", -1, "Reboot Required", wshYesNoDialog + wshQuestionMark)
If intReboot = wshYes Then
objShell.Run ("C:\WINDOWS\system32\shutdown.exe -r -t 0")
ElseIf intReboot = wshNo Then
Wscript.Echo "Please reboot as soon as possible."
Else intForcedReboot = objShell.Popup("Your computer will reboot now.", 10, "Warning", wshWarningMark)
objShell.Run ("C:\WINDOWS\system32\shutdown.exe -r -t 0")
End If
ElseIf intReturn = wshNo Then
Wscript.Echo "Please run the update process as soon as possible. You will not be able to utilize the many features of Lync until you do so."
Else
'---------------------------------------------------------------------------
objShell.Run(InstallScript), 0, True 'Change the install script location as needed.
'---------------------------------------------------------------------------
objShell.Popup softwareTitle & " is complete!", _
-1, "Install complete", wshInformationMark
End If

' End If for software Title = false and install
End If

objTextFile.Close

' Check the operating system
Function IsWindows7
Set OSSet = GetObject("winmgmts:{impersonationLevel=impersonate}!//" _
& "./root/cimv2").ExecQuery("select Caption from Win32_OperatingSystem")
For Each OS In OSSet
sOS = OS.Caption
Next
IsWindows7 = (InStr(1, sOS, "Windows 7", 1) + InStr(1, sOS, "Vista") > 0)
End Function

' Force a UAC challenge
Sub ElevateUAC
if not isWindows7 then Exit Sub
sParms = " |"
If WScript.Arguments.Count > 0 Then
For i = WScript.Arguments.Count-1 To 0 Step -1
sParms = " " & WScript.Arguments(i) & sParms
Next
End If
Set oShell = CreateObject("Shell.Application")
oShell.ShellExecute "wscript.exe", WScript.ScriptFullName & sParms, , "runas", 1
WScript.Quit
End Sub