I think there is more to your message. It probably states C:\Windows\System32\filename.dll is not compatible or something similar. Windows can repair corrupt or missing system files by using the system file checker. It must be run in an elevated Administrator command prompt. Click the start button and type CMD in the search field. Hold the left shift key and right click the entry found. Choose Run as Administrator. In the DOS window type SFC /scannow. It will tell you what it fixed and might say it couldn't fix it.