Spybot is available from
here
Search for "spybot", use the drop-down arrow to select "downloads", then "go",and you can have a good read about it for yourself. Click on "77%" or whatever the rating is, and select to view all positive, all negative, etc. reviews. Then download it anyway!
It's no more difficult to control than Ad-aware IMHO. BTW, you have checked for updates with Ad-aware have you?
I have both Ad-aware and Spybot on my desktop; no conflicts, no probs at all.
Tip. Before scanning with either, empty cache (as you said you do), otherwise you can go down the pub for a couple and return before they finish due to the pointless checking of Temporary Internet Files which you delete regularly with impunity anyway.
Still there? (the problem that is, not you) Well another avenue to go down might be; Start->Settings->Control Panel->Add/Remove Programmes. Have a snoop around; top of the list will probably be Ad-aware 6, adobe, etc, etc. Scroll down; if in doubt leave it there, but it should be easy to spot any offensive programmes that have esconced themselves in your HD.
Let me know
bug