Try AVG AntiVirus/AntiSpyware. Free and works well. Or there's Windows Defender if you're not on a Mac. Or, if you have Comcast Internet they give you a free copy of McAfee Security that you can download online.
america, fuck yeah.
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(on May 14): Schweitzer closed with 140 inches of snow at the summit. They got 5 new inches May 13th for a summit depth of 134". Remind me why they closed again?
avg is a solid antivirus, but should be complemented with one of these antispywares as well
spybot search and destroy is fast efficient and to the point, i prefer it over adaware but they both work great. If you use search and destroy on vista you have to right click it and click run as administrator, so it has the rights to do what it needs to do. this is probably true for ad aware as well