1. Reinstall the application which may trigger viber exe is nota valid win32 application errors.
3. Download and install the latest drivers for your computer.
And then click Device Manage. Check carefully and see if there is a yellow exclamatory mark. Double click it and click update drivers.
System File Checker is a utility in Windows that allows users to scan for corruptions in Windows system files and restore corrupted files. All you need to do is just click Start–Type CMD in the searching box–type sfc /scannow and click enter.
Win 10 Restore:
Win 8 Restore:
Win 7/vista Restore: