[Coda]

With no offense intended... it doesn't work that way.

Disk space and RAM are not related, and of the two it's RAM that affects how fast things run. Uninstalling programs won't make anything run any faster compared to simply not running that program -- in your case, Sims 2 won't be slowing down your computer when you're not playing Sims 2 (although because of Windows's memory management you may need to reboot afterward to get your full performance back).