I assume you're paying for your McAfee subscription otherwise I'd recommend uninstalling them all and going for AVG. It's free and in my experience operates less sluggish than McAfee or Norton. (It still has the drain on resources but most anti virus programs do.)
Vista's gotten a lot better with Service Pack 1 that got rid of a lot of issues. If you do end up going for Vista whether because of price or lack of options, I definitely recommend getting at least 2GB of RAM. 3GB if you can afford it.
I just switched from XP to Vista and I've only had one issue that took all of two minutes to resolve. (And hey, you could always go for OSX or Linxu if you wanted. :D )
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Vista's gotten a lot better with Service Pack 1 that got rid of a lot of issues. If you do end up going for Vista whether because of price or lack of options, I definitely recommend getting at least 2GB of RAM. 3GB if you can afford it.
I just switched from XP to Vista and I've only had one issue that took all of two minutes to resolve. (And hey, you could always go for OSX or Linxu if you wanted. :D )