error messages

HRESULT: 0x800736FD

These ones are typically caused by underlying problems on the PC that also often cause Windows Updates to fail to install. If we can fix the Windows Update trouble, we can usually get the iTunes trouble cleaned up en passant.

Go into your Windows update and try to check for new updates. If updates install, stock up on the ones you're behind on, restarting the PC if requested to do so. After the restart, try installing iTunes again. Does it go through this time for you?

If windows updates fail to install, go into your Update History and doubleclick the failures. What alphanumeric codes appear for you? Are they also 800736FD, or some other number? (If they're another number, what number are you getting?)

I tryed double clicking and they don't update. Some of the error codes are 80246005 but most are Code 643.

643 isn't a particularly nice one. (It's a pretty generic number ... but some of the multitudinous possible causes are quite difficult to deal with.)

Try the Fixit Center at the following MS page:

http://fixitcenter.support.microsoft.com/Portal/WhyFixIt

(Fingers crossed, one of their relevant fixits might help.)