QUOTE(seasideRN @ Jul 10 2008, 04:18 AM)

I have spent quite abit of time over the last 2 days trying to get rid of Ad-aware 2008 (free) so that I could reinstall McAfee (which had stopped working properly.) I have tried all the suggestions on the web site, but still have the problem as you described it. McAfee rep directed me back to Lavasoft, but since I have a free version, I can't seem to get to their solutions.
Other suggestions I have tried: reinstalling 2007 and removing it as recommended, reinstalling 2008 and removing it as recommended, doing searches and deleting all found files, even deleting registry keys.
I would also be greatful for any suggestions.
Nobody's mentioned their OS - and the following from me is for XP, but here goes...
I use CCleaner for Registry cleaning of uninstallers etc. Download from
http://www.ccleaner.com/ First - BACK-UP all important data...
Then, run a Check Disc: Right click onto C Drive in My Computer->Properties->Tools->Error Checking. Check both boxes - observe the pop-up->Restart your PC. Allow the Check Disc to run.
Reboot (automatic after a Check Disc scan)
Then run CCleaner through your registry. If you've never cleaned your registry, check the options one-at-a-time.
You might have to run it quite a few times...!
Finally, finish with a full Defragmentation of your HD.
Reboot. Then try a Mcafee install.
This clean-up routine has worked for me always (so far, touch wood) - but each computer is different.
Others recommend WICU ( Windows Install Clean Up Utility/ Freeware by MS ), but I've never tried it.
However, read
this by Raziel. It's another avenue to explore.
Hope that this helps...?