Hi, I have had a few malware problems over the last couple of years, and maybe as a result of trying to clear that up I have had a problem with the Windows installer. It does not seem to exist anymore. Whenever I try to install a program that requires it (such as itunes), I get the popup that says "preparing to install" followed by another that says "the windows installer service could not be accessed. this can occur if the windows installer is not correctly installed." I have tried downloading things from the microsoft website but nothing has worked. What can I do? Should I format and reinstall windows xp?