Error: Program cant start because MSVCR80.dll is missing

Error: "Program cant start because MSVCR80.dll is missing..."

Go to Control Panel > Add or Remove Programs (Win XP) or Programs and Features (later)

Remove all of these items in the following order:

• iTunes
• Apple Software Update
• Apple Mobile Device Support (if this won't uninstall press on)
• Bonjour
• Apple Application Support

Reboot, download iTunes, then reinstall, either using an account with administrative rights, or right-clicking the downloaded installer and selecting Run as Administrator.

The uninstall and reinstall process will preserve your iTunes library and settings, but ideally you would back up the library and your other important personal documents and data on a regular basis.
https://discussions.apple.com/message/24620553#24620553

To get the DLL file:  http://www.msoutlook.info/question/369 

Also good step by step directions from about.com