HI
I suspect you are running out of available memory.
End all non essential programs before running SH3 and increase your Page File size, aka Virtual Ram.
On XP > Control Panel > System > Advanced > Performance Settings > Advanced > Virtual Memory Change. Under Custom, set it to 3056, click set and reboot.
Also, if XP is automatically rebooting you, do this: Control Panel > System > Advanced > Startup & Recovery > Untick Automatically Restart. Doing this will tell you whether XP is at fault or whether Sh3 is at fault because you should get an error report following the failure of SH3.
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