If you really want to speed up your system - get an iRAM drive with about 1Gb RAM in it and use that as your Windows swapfile drive. That way, when windows pages out to Swapfile, it pages out to RAM, rather than a hard disk and because it's spoofing that it is a HDD, any version of Windows is radically speeded up by it. There is very little point having it bigger than 1Gb because of how the swapfile works, but with 128Mb sticks now costing £5 each, you can put a 512Mb iRAM in your PC for well under £100 or a 1Gb system for about £120.
Originally these were sold as boot disks, but there were issues with them and they were very expensive, however they make much more sense as swapfile disks, plus the price has fallen quite dramatically.