The problem is that the Splinter Cell 3 copy always detects daemon-tools. But there is a proper solution, to stop StarForce scanning for daemon-tools! I translated it from the german, so please excuse me for mistakes
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1. Start Regedit.
2. Goto: "HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\Scsi" and you will see some folders with this syntax "Scsi Port X".
3. Search through the folders for an entry called this: "Driver=d347prt". This is the daemon-tools drive.
4. Now to stop the copylock from scanning for daemon-tools simply rightclick on the folder which includes the D-Tools drive and click on "Permissions" (i don't know if this is socalled in english version of winxp).
5. Now you will have to activate "Deny/Read only" at "Administrators" (i don't know if this is socalled in english version of winxp).
NOTE: You always have to repeat this steps after reboot, but it works fine for me.