If you have XP, you could try reducing audio acceleration.
If your video card is low end, you could reduce video effects in the game's options.
If you're using an antivirus, it may be monitoring the game in real time and slowing it down.
It would help if you could send us your computer specs --
Windows version
Model of Video card and video driver version number and date
Amount of system memory (RAM)
etc.
You should be able to get most of this information by using the Belarc Advisor that Inferno talks about on
***This page***.
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witter
Glozza