Isn't XP a 32-bit version as Windows 7 can run 64-bit? If I remember correctly a 64-bit version can take advantage of memory over 2 GB and a 32-bit system can only allocate 2 GB to a program. Do you use the 4 Gigabyte patch that can be found in downloads section or do you use H.sie's mod that has a 4 Gigabyte switch built into the mod? (Sometimes more memory seems to help with SH3 CTD's.)
I think that You also need to ensure every file is under full user rights, including the save game folder.
I've been a very happy SH3 Windows 7 64-bit user, though of the Windows 7 Home version. I'm sure there is a way to get your game to run and run better in Ultimate than in XP.
Is your computer new btw or did you just upgrade your old one?
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