I've downloaded the Quake 4 demo.exe from multiple locations and everytime I run the .exe I get the error "Quake4_demo.exe is not a valid win32 application".

Read: How to fix Not a valid Win32 application error? Does installing antivirus slow down a PC? Antivirus programs work in such a way as to know when you’re not gaming or using your computer and ...

Faulting Application Path: iusb3mon.exe In order to fix the iusb3mon.exe system errors, first, you need to understand if it is a genuine component or a malware file camouflaged as iusb3mon.exe.

Further reading Microsoft TechNet Forums: Vista SP1 - "Not a Valid Win32 Application Error" Emil Protalinski 0 Comments ...