Problems with VM taken from Snow Leopard 32 to 64 bit

I have a new large iMac with 8 GB memory (so I guess it runs Snow Leopard in 64 bit mode). Previously, I had an older macBookPro which ran in 32 bit mode. I migrated everything from the macBookPro to the iMac using the migration utility and the macBookPro in target mode. While Win XP and Linux System run w/o problems (I has, this is strange enough, to re-install parallels tools), both Win 3.11 and OS/2 (ECS) do not work on the new iMac: win 3.11 keeps accessing the disk constantly and OS/2 crashes while LVM is loaded.