Systems Management

Can anyone help please.
After using a junk remover programme I now cannot load any office application or Word. The windows insataller loads a pop up stating "prepairing for installation" it hangs and can often refresh itself several times, over a couple of minutes before either completing a task successfully or giving an "error" message. This pop up is appearing for many different applications including Outlook Express, here it takes ages just to load a new message window and spell checker always comes up with an "error". A user recognition message which appears when trying to load Word states.. " Microsoft word has not been installed for the current user. Please run set up to install the application."
I'm pretty much a novice but despite searching the microsoft knowledge database cannot find my specific problems.
I have uninstalled and reinstalled windows installer and XP service pack 2 with no effect. An error cure programme I downloaded this morning has at least fixed some things and I can now get a new message window in OE almost instantly without the pop up appearing but I still can't spell check. I would greatly appreciate a fix for this very annoying and time consuming problem.
At the moment I can't run the windows installer clean up tool because I have misplaced (lost, can't find) the registry keys for my discs and therefore can't reinstall either office XP Pro or Word
Thank You
Kind Regards to all