Looks as if you spent some time getting rid of that adware annoyance !
When you go to: Start > Control Panel > Add or Remove Programs
Is there any reference to the Ask.com Toolbar there?
If you would like to post a HijackThis log, and an Uninstall List, would be glad to take a look so you can make sure there are no remnants left:
Please download the latest version of HijackThis:
Save to the Desktop.
Double-click on HJTInstall.exe to install the program.
A prompt appears showing that, by default, it installs to:
C:\Program Files\Trend Micro\HijackThis
At the main screen of the program, click on: Do a system scan and save a log file
When done scanning, a log appears on your Desktop.
>>Save to the Desktop, and post the HijackThis log in your reply.<<
Start HijackThis once again. This time, click on Config > Misc Tools > Open Uninstall Manager
>>Save the Uninstall Manager list to the Desktop, and also post in your reply.<<
Retired - Doin' Dis, Dat, and slapping malware.