The following info I received from one of our very highly trained Guru's (Gerard), about this problem.
Read this: http://www.optimizingpc.com/optimize...sservices.html
And this one: http://www.optimizingpc.com/optimize/deletefiles.html
Or If you have not done already, clean the junk files in the system. Download CCleaner and install it. Run it and click "Options" button and here go to "Advanced" tab and uncheck the option "Only delete files in Windows Temp folder older than 48 hours". Click OK to exit from the Options. Finally click "Run Cleaner" and click "OK" to continue cleaning. It's also an perfect program to clean your reg.