I am working on a clients computer, WinXP Media Center, SP3. Pulled several bits of malware out and installed some of the suggested cleaners, updated same and everything seemed to be running well except Internet Explorer. Tried to run Windows Update and got error message that indicated missing/corrupt files. Ran Dial-a-fix and uncovered several files (rundll for one). Ran sfc /scannow, returned error that Media Center and XP Pro install discs were not the correct disc (actually asked for XP Pro install disc). Do I need an XP Pro disc with SP3 slipstreamed? Or do I need a specific OEM disc from Dell?