The problem only relates to the latest up-date from Spysweeper. Webroot is working on a fix for that program, and should release a fix soon.
oldhead has the best work-around here:
http://www.lavasoftsupport.com/index.php?showtopic=2187QUOTE
This should work for everyone currently having the problem of Ad-Aware freezing/hanging up due to a conflict with the new, updated version of Spy Sweeper (5.0.5.1286):
After right-clicking on SpySweeper icon in notification tray, click on 'Shields ' , then the'Windows System' Tab , under 'Critical Shields' UNCHECK 'Memory Shield' AND 'Spy Installation Shield' ....Ad-Aware Scan should now run...WITHOUT having to disable SpySweeper (the other 11 shields are still functional!). Once Ad-Aware scan has finished simply RECHECK the boxes and close the window .
Spike