I'm guessing for the price, the computer came loaded with a ton of crapware. If you have the recovery cds, the first thing I would do is wipe the system out and start from blank. Of course, if you do not have nagging software, then you obviously don't want to do that.
If you aren't attached to the "cool" effects of Vista, then disable as many as you can.
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^ I also found this on another forum. Since I do not run Vista yet, or plan on it anytime soon, I'm not sure exactly what a lot of problems are first hand. But I'm sure this guy does
Hope I helped