1.) Do an uninstall of SH3. When the uninstall is complete, go into your control panel and verify that all files and folders have been removed from your C:/Programs/Ubisoft/SH3 area. Delete manually anything that may remain.
2.) From the control panel, go to your My Documents and Folders folder, look for SH3 and delete any and all files remaining there.
3.) Click on RUN, type in REGEDIT and hit ENTER.
Scroll to HKEY_CURRENT_USER, highlight and expand the tree, scroll down to SOFTWARE, highlight and expand the tree again, scroll down to UBISOFT, expand the tree and scroll down to SILENT HUNTER III, scroll down to KEYS and highlight it. Now, on the right hand side, you should see two items, one is 'default', and the other should be called DiscKey_SH3...and to the right of that one should be your 25 character DVD code. Delete that entire line.
4.) Back up and find HKEY_LOCAL_MACHINE, and once again, scroll down to SOFTWARE, scroll down to UBISOFT and delete the entry.
5.) Delete the desktop icon/shortcut. Since this points to an old install, that pointer should no longer exist.
At this point, you SHOULD have all pointers to the original game installation(S) removed. NOW try a complete, fresh, clean install of SH3!
