Problem playing iTunes in Windows XP

Hi Amigos,
Well, after updating the iTunes 7.6 to 7.7 and also the QuickTime I got these error that can’t run iTunes. It’s really confusing why this error appears in iTunes which I expect more that compatibility of both applications adapt easily. I’m running the iTunes in Windows XP Home edition. Help please! Thanks in advance Amigos.

iTunes
iTunes cannot run because it detects a problem with QuickTime. For repair instructions, click Help.
Ok
Help
