SFC /scannow is a super-useful command you can use in any Windows version since Windows 2000. When the SFC (System File Checker) command is used with the /scannow switch, the tool will scan all of the important Windows files on your computer and replace them as necessary.
Missing and corrupted operating system files (like many DLL files) are arguably the biggest cause of major Windows issues. Considering that, plus the fact that SFC /scannow is completely automatic and very easy to use.
The System File Checker (SFC) enables an administrator to scan all protected files to verify their versions. If the SFC finds a protected file has been overwritten, it retrieves the correct version of the file from the cache folder or the Windows installation source files, and replaces the incorrect file with the correct file. SFC also checks and repopulates the cache folder. If the cache folder is damaged or unusable, use the sfc /scannow command to repair its contents.
You can run the SFC if and only if you are logged in as an administrator OR as a member of the Administrators group.
Because corrupted files in Windows can cause errors in QuickBooks, run the System File Checker as part of your QuickBooks troubleshooting.
For detailed instructions and information about the System File Checker, refer to this Microsoft support web site:
Note: If you are not comfortable doing these steps, please contact a local IT guy or Microsoft for assistance.