I use Spyware Stormer to keep all of the crap out of it. It costs $29.99 ( a one time fee ) but it works great.There are a lot of rogue and suspect anti-spyware programs out there. Some will even install spyware and adware on your computer. A good comprehensive list can be found
here. Spyware Stormer is listed and is a
variant of Ad Aware which is free. The author claims that it is clean, however.
There are free Spyware programs, but some of them don't work too well and you can't update them.That is simply not true. Spybot S&D is updateable from within the application itself. The free version of AdAware also updates itself from within the application.
I wholeheartedly recommend both
Spybot and the free version of
AdAware, and use them on all my clients' machines. What one does not catch the other will. Don't forget to use the Immunize feature in Spybot.
If you are infected with one of the CoolWebSearch variant browser hijacks then you will need
CWShredder. You will want to run the
MiniRemoval tool first though to in case you have the CoolWWWSearch.Smartkiller.
If all other efforts fail, then download and run
HijackThis. You probably won't want to immediately act on anything it finds because if you use this program indiscriminately you can foobar some of your software. You'll most likely want to post your HijackThis log to
this forum where you can get help with identifying the particular critters infecting your computer. They also have a good
SpyWatch forum where you can find out if the program you downloaded installs spyware or adware.
As far as antivirus programs go, I recommend
AntiVir Personal Edition. While not as pretty as McAfee or Norton, it is free and arguably more accurate.
Finally, and I can not overstate this,
stop using Internet Explorer and Outlook Express! Yes, I understand there are a precious few websites out there that will only work with IE. For those rare occasions, go ahead and use it. The rest of the time, however, there is no excuse not to use
Mozilla Firefox and
Mozilla Thunderbird. IE and OE are gaping security maws and the primary avenue of infection on a Windows system. Furthermore, Firefox and Thunderbird are simply technologically
better.