I am using Windows 7, While booting I get error dialog box just before login screen.

Box says: "Microsoft Visual C++ Runtime library, Runtime error!
Program: C:\windows\system32\nvvsvc.exe"
This app has requested the rumtime to terminate it in an unusual way. Please contact the app support team for more information.

When I click “ok” the screen goes blank just the cursor is there. plz help me.