when switching between game windows. How to Properly Download and Restore iw3sp.exe
Rather than downloading a standalone .exe from untrusted third-party sites—which can carry malware—use these official and community-vetted methods: Call Of Duty 4 Modern Warfare Iw3sp.exe Download
If you own the game on Steam, you don't need a manual download. Right-click in your library. Select Properties > Installed Files . when switching between game windows