file mismatch

The file mismatch tag on WindowsForum.com covers issues where Windows activation or validation fails due to a mismatch between system files and expected digital signatures. A common example is error 0x8000247 in Windows 7, which can occur after installing an optional hardware driver update, even after a System Restore. Users may also encounter similar errors when running the Windows Update Readiness Tool. The Microsoft Genuine Advantage Diagnostic Tool often reports validation code 0x8004FE2 in these cases. Troubleshooting typically involves checking for corrupted or mismatched system files that prevent genuine validation from completing.