I offer this; others may advise to do/use something else:
The following is what I recommend: In addition to any on-board antivirus you may have (and you SHOULD have one) the use of this procedure should help eliminate most, if not all, of your 'hidden agendae'.
First, let's clean up your computer and clean it out as well.
1- Start Internet Explorer, click tools, internet options, then click delete cookies, delete files (check offline too) and clear history, one at a time.
2- Then click Start, programs, accessories, system tools, and then click Disk Cleanup and check ALL the boxes displayed (may take a couple min's).
3 -Open Windows Explorer and under My Documents create a new folder 'AdAware'.
4 -Go online and download AdAware SE (free version) to that folder: http://www.majorgeeks.com/Ad-Aware_S...onal_d506.html
5 -Open the AdAware folder, and install AdAware SE.
6 -Run it, and click on the 'planet Earth' icon and update AdAware SE immediately (click 'connect').
7 -Once that is done, run AdAware SE full scan.
8 -When the scan is done, click the box(es) beside ANY Critical entries and continue.
9 -Download Spybot - S&D; create a NEW folder 'Spybot' in My Documents and save it there: http://www.majorgeeks.com/SpyBot-Sea...roy_d2471.html
10-Open that folder, install Spybot, then run Spybot and do an 'Search for updates' immediately
11-After updating, do a 'Check for problems'
12-Anything in RED put a check beside and then click 'fix selected problems'
13-Make sure your Trash Barrel is empty (recycle bin)
14-Assuming you are still in operation, defragment your drive.
15-Reboot.
Note: ' Major Geeks ' is a reliable site that has both those programs free.
http://www.majorgeeks.com/
http://www.majorgeeks.com/Ad-Aware_S...onal_d506.html
http://www.majorgeeks.com/SpyBot-Sea...roy_d2471.html

