Member Avatar for rangerken

AVG Antivirus moved the mfc45.dll to the virus vault because it was corrupted. Is it necessary? If so, how can I get a replacement file?

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Dani AI

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Brief recap and safe next steps for : AVG quarantined a file named mfc45.dll. As observed, that filename is not typical for official Windows MFC runtime files, and 's suggestion to grab a DLL from a generic download site is risky. The safest path is to identify the source and repair it rather than dropping a single DLL into System32.

Immediate checklist (do these in order):

  1. Check AVG quarantine details for the original file path and any malware name. Restore to a temporary folder only if you need to inspect it — do not restore straight into system folders. Scan the restored copy with an on-demand scanner before doing anything else.

  2. If a program now shows "missing mfc45.dll" errors, reinstall that program or its official redistributable instead of downloading a lone DLL. Many apps include their required MFC runtime in their installer.

  3. Repair Windows system files:

    • Open an elevated Command Prompt and run:
    sfc /scannow
    • On Windows 8/10/11, if sfc reports problems, run:
    DISM /Online /Cleanup-Image /RestoreHealth
sfc /scannow

  4. If the quarantined file looks suspicious, upload it to a multi-scanner service before restoring, and run a full anti-malware scan (reputable scanners only). If you cannot identify the owning application and the file was flagged as malware, leave it quarantined and reinstall affected software from official sources or perform a Windows repair/restore.

Do not use generic "DLL download" sites. They often distribute outdated or infected files and can make the problem worse.

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Member Avatar for chrishea

This is probably not a real windows dll. I checked on my system (Windows 7 64 bit Home Premium) and there is no such file in Windows/System32. There is an mfc42.dll but no mfc45.dll. What I found with a search seemed to confirm that.

Member Avatar for Member #545322

http://www.dll4free.com/. Many more sites available just google and download it and put the .dll file in appropriate directory.

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