When Windows XP cannot find "rundll32.exe"

If you open the control panel and suddenly find that "Windows" cannot find the c: \ windows \ rundll32.exe ...... "on the screen, what should you do? Your computer can be infected with viruses that have been damaged by rundll32.exe. Solution: 1. Put the Windows xp cd into the optical drive. 2. Run CMD in the "run" menu and press Enter. 3. Enter expand <CD-ROM:> \ i386 \ rundll32.ex _ % SystemRoot % \ rundll32.exe, where <CD-ROM:> represents the drive letter, be sure not to enter ".