Sometimes when you install third party software, it may overwrite important operating system files. This can cause instability - or worse. Windows XP includes a command line tool that you can use if you think this may have happened (for example, if you get a message box warning that there is a problem with a .dll or the system just seems unstable). Here's how to use it:
- Click Start | Run.
- In the Run box, type: sfc /scannow Windows will scan all protected Windows files to verify that they are intact and in their original versions. If they're not, corrupt, missing or incorrect files are replaced. You may be prompted to insert your Windows XP installation CD if your Dllcache folder (where Windows keeps a copy of essential system files) has become corrupt or has been deleted.
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