Then, exit cleanly. The config will save.
Do not try everything at once. Start with #1 and work your way down.
The iw6sp64-ship.exe error is not a sign of a broken PC or a faulty game disc—it’s a scar from a transitional era in PC gaming, when developers bet on 4GB VRAM being the future but didn’t anticipate 8GB+ cards, high-core CPUs, and Windows’ changing display stack. For most users, the VRAM scale tweak (Fix 1) combined with Fullscreen Optimizations disable (Fix 2) will banish the error permanently.