----Taken from http://www.techduke.com/2007/07/29/w...rage-graphics/
For adequate Vista performance, you need at least a midrange processor, which means an Intel Pentium 4 or Celeron, or an AMD Athlon or Sempron running at 2.663.0GHz. Faster is better, of course, but only if money is no object. Moving up to 3.2GHz or 3.6GHz might set you back a few hundred dollars, but the performance improvement won’t be all that noticeable. You’d be better off investing those funds either in extra memory (discussed below) or in a dual-core processor.
in other words, your processor is only giving you enough juice to support Vista and no other programs.. if you want to upgrade, a dual core processor at 2.8 ghz or higher would be your best bet