I do a dualboot Vista and XP sp2.
I didn't activate XP till it was too late and couldn't play SH3.

I went thru 30 days in less than a week.
After many tries I was about to give up.
I finally solved the problem. I made a SH3 folder in my User folder in Vista.
Ithen went to my XP program files and copied the whole thing and in the Vista User folder where I made the SH3 folder and pasted it there.
SUCCESS

I'll deal with activateing XP later... maybe:p :rotfl: