iTunes has encountered a problem...

Generally, when you get this message very randomly, you have been infected by a version of malware that is rampant in the Wide World of Windows causing this errorless crash and burn of iTunes. There is a free malware tool that is capable of finding and removing it. It is called Ewido and it is excellent. Find it here: http://www.ewido.net/en/
Let's scan your PC and see if you can get iTunes to open.
Rachyl

Did you run the EWIDO scan? Check to see if you have Quicktime installed. It could be a broken Quicktime. Installing the Quicktime Standalone player will resolve this issue. Let me know if you need the link. Go to Apple.com and search for Quicktime Standalone. It should come up.

Is it simply not opening or will it not download properly? You never told me if you did the EWIDO scan or not.

Tell me, what antivirus program do you run on that XP box?
Rachyl

even after dowlloadin even quick time is showing the same error

jazzyminhas, could you let us know what the error message says when you try to open your QuickTime? include error mesage numbers if you're getting any.

I would suggest running the repair permissions in Disk Utility (Applications/Utilities/Disk Utility). Many people don’t even know this exists and never do a repair, which slows you down and can have crashing problems. Once you have it open select the drive you are having the problem on and click "Repair Disk Permissions." There is no need to verify because if you repair it does it as part of the process. Hope this helps

-Matt

Matt,
although that works on a Mac, it does not however, work on a Windows PC
Rachyl

Quicktime failed to initalize. Error #-2095
Please make sure QuickTime is properly installed on this computer.

hmmm. that one isn't very specific. sometimes the error message will give us clues as to the nature of the hassle with the QuickTime, but that one didn't in this case.

so let's try a "diagnostic" standalone QT 7.1 install. at the very least, the error message we get from the QT install will give us some more info about what the underlying problem is.

from the following link, download and save a fresh copy of the QT 7.1 standalone installer to your hard drive. (we'll run the install from there rather than online.) switch off antivirus and antispyware applications prior to the install.

Quicktime 7.1 Standalone Installer

if you get an error message on the QT standalone reinstall, let us know what it says. include error message numbers if you're getting any.