I would like to throw in my two cents.
In addition to getting a good scanner, use Firefox and get the NoScript addon. I will warn that NoScript does become somewhat annoying when you visit sites for the first time, since it literally blocks all scripts. Your first visits to sites like YouTube will require you to add both youtube.com and ytimg.com to the exception list (which is as easy as clicking the NoScript icon and saying "Allow <insert address here>").
For me, the security benefits of NoScript far outweigh the minor inconveniences (many sites work fine with all scripting disabled), and I haven't had a single piece of adware or malware on my system since I started using it.
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