You have a slow laptop, which means you're not gaming on it. I suggest you install a linux distro on it(say, ubuntu). It's free, gets no viruses and runs faster than windows all the time. It should have about all the apps you'll need.
your specs say 3gb ram? Why not run windows 7 advisor on it and then upgrade to windows 7? Linux is crap as far as getting compatable apps....it's a poor mans OS. Windows 7 will be a big improvement on that vista PC. Vista was always a pig on resources. Once you convert to win 7 you can easily use Avast Free.
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