The Microsoft Windows rundll32.exe file enables a computer to run Dynamic Link Libraries (DLLs). Like any other Windows file, rundll32.exe can become corrupted or infected by a virus. For this reason, Microsoft includes a backup copy of rundll32.exe on the Windows installation disc. However, if you don't have this disc, you can use Windows System Restore to fix this problem. System Restore will "roll back" your computer to a point before you deleted rundll32.exe or it became corrupted. If System Restore will not run normally, run it in Safe Mode.
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Log on to your computer as an administrator.
Close any open files and save your data in any open programs.
Open "System Restore" by clicking "Start" and then typing "System Restore" (without the quotes) into the search box above the Windows icon or Start button. Click "System Restore" in the list of options provided. Click "OK" if prompted, then click "Next" in the "System Restore" application window.
Select a restore point from the list provided. Windows periodically creates "restore points" that record your computer's programs, hardware and registry setting. Choose a date before the day on which you started having problems with rundll23.exe.
Click "Next," then click "Finish" to begin System Restore. Windows will automatically restart your computer in order to return it to the restore point you selected in Step 4.
Boot your computer in "Safe Mode" by restarting it and holding the "F8" key as the computer reboots.
Open the command prompt by clicking "Start," then typing "cmd" (without quotes) into the search box.
Type "rstrui.exe" (without the quotes) into the command prompt, then press the "Enter" key. Click "OK" if prompted. Click "Next" to proceed to the "Select Restore Point" panel.
Select a restore point from the list provided. Choose a point whose date falls before the day on which you started having problems related to rundll32.exe.
Click "Next," then click "Finish" to begin the System Restore process. System Restore will restore your operating system to the earlier configuration.
Tips and warnings
- Avoid accidentally deleting rundll32.exe by always using the Control Panel's "Add/Remove Program" feature to uninstall applications.
- System Restore will undo all changes to your system, including application installations or uninstallations.
- System Restore does not affect personal files like documents or photos.
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