Simple fix for missing or deleted Rundll32.exe file
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Put the Windows XP CD ROM disk in the CD ROM drive.
Click Start, and then click Run.
Type: expand X:i386rundll32.ex_ c:windowssystem32rundll32.exe in the Open box, change X to the letter of your CD ROM Drive. Run it.
Restart the computer
if that fails try fix below:
Go to Start, then to Run, and type in “SFC.EXE /SCANNOW” (without the quotes – and with a space between the SFC.EXE and the /SCANNOW). The press Enter. (For VISTA, go to Start and type in the above information, then go to the top of the box and right click on SFC.EXE /SCANNOW and select “Run As Administrator“)
The program may (or it may not) ask you for your Windows XP installation CD – please insert it at the prompt. If it doesn’t ask you for the CD this means that it wasn’t necessary to replace any files.
File from SP2 i386 folder
https://briteccomputers.co.uk/downloads/XPSP2-rundll32.rar
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File from system32 folder
https://briteccomputers.co.uk/downloads/rundll32.rar