can not install itunes in windows xp

Do you get an error message when you try to install iTunes? If so, what does it say? (Precise text, please.)

I also can not iTunes to download

I get this message

An error occurred during the installation of assembly 'MircosoftVC80.CRT.type="win32".version="8.0.50727.4053".publicKeyToken="1fc8b3 b9a18e3b".processerArchitecture="amd64"'. Please refer to help and support for more information. HRESULT:0×800736FD

An error occurred during the installation of assembly 'MircosoftVC80.CRT.type="win32".version="8.0.50727.4053".publicKeyToken="1fc8b3 b9a18e3b".processerArchitecture="amd64"'. Please refer to help and support for more information. HRESULT:0×800736FD

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?)

When I try to check for updates, windows says that an error ocurred while checking for new updates for your computer and i get the error code 80080005

Not my favorite number in this context.

Just in case, let's try the following Microsoft fixit:

http://support.microsoft.com/mats/windows_update/

Does that get your Windows Updates installing again? If so, stock up, restart the PC and try another iTunes install. Does it go through any better this time?