Vice City problems

[newbie__2003]

I have performance issues with GTA 3 Vice City under Windows 98 SE with NOCD crack. The problem is that the game becomes very choppy and keeps stuttering/freezing whenever you collide with cars and objects. It actually becomes unplayable. This is strange, as I also have GTA 3 installed and it runs perfect. I have a dual boot setup with Windows XP pro installed on another partition. I also have both games installed on my Windows XP partition and they both run very smoothly. I can play the game in windows XP, but I want to know why it wont run properly under windows 98. I have all the latest drivers and I have also tried using older ones for video. My Windows 98 install is very clean and has no background programs running. I have tried re-installing the game too. Anyone else had similar probs?

My system spec is:

Mobo: Asus P4PE
CPU: P4 2.8
Mem: 512mb PC2700
Video: GF4 Ti4600
Audio: SB Audigy 2
H/D: 120gb IBM

OS's: Win 98 SE, Win XP Pro SP1