SuSE causes Win2K to lockup on dual boot system

I have a dual boot Dell 8100 laptop that I use at home and at work. When I boot into SuSE 8.0 then go back to Win2K, after logon and windows starts loading programs, it all of a sudden locks up and the only way to get out of it is the power switch. After this, windows does a check disk, then boots and loads OK and can reboot back into windows without going to SuSE and it will be OK. Have done a disk check and defrag, file system is fat32, and used Norten system tools to cleanup the registry. Still same problem. Anyone have any idea on this problem? Art