Need Help, Fixing Problem.

I Downloaded Limewire, and it slowed my Comp. Down, so i uninstalled it, and its still running slower, i was just wondering if someone can help me Remove or fix whatever this problem is.
My Computer has been running slow, when i open Programs, they sometimes freeze, I Couldnt Load Mozilla Firefox, without it freezing, and the Computer is slow on Start-up..im using Windows 98, and something seems to be taking My Memory, or RAM or something, I Would Appreciate it if someone could Help.

Thanks