How to Fix Rundll Errors for Free

By Bruno Fuerte

Rundll32.exe is a system process that is an integral part of Windows XP and other Windows operating systems. When the file becomes corrupted, the system may crash or Windows may be unable to load. You should first determine what is causing the rundll32.exe error, fix that problem, then replace the system rundll32.exe file to ensure any remaining issues are resolved.

Things You'll Need

  • WIndows system disc or OEM recovery disc

Step 1

Run Windows in Safe Mode. Restart the computer. At reboot, press the "F8" key repeatedly. Keep tapping "F8" until the Windows Advanced Options menu appears. From that menu, select "Safe Mode No Networking" and press "Enter."

Step 2

Run antivirus and antispyware scans. This may take several minutes, depending on the size of your hard drive. Delete any malicious programs that are discovered. Reboot the computer.

Step 3

Insert the Windows system CD or OEM system recovery CD after Windows has loaded.

Step 4

Replace your old rundll32.exe file. Click the "Start" menu and select "Run."

Step 5

Type in the "Run" dialog box (without quotation marks):"expand X:\i386\rundll32.ex_ c:\windows\system32\rundll32.exe" with "X" being the letter of your CD drive. This will install the original rundll32.exe file that came with your Windows software. Reboot.

Tips & Warnings

  • If you are unable to boot into Windows even in Safe Mode, you must perform a Windows Repair Installation. A link in the "Resources" explains this process.
  • Beware of third-party software that claims to repair rundll32.exe files or websites that claim to offer free "dll" files for download. Many of these programs install malware on your computer, compounding your system problems.