How to transfer large videos from iPad 2 camera roll to Windows XP?
Solution 1:
There's an iOS app called Photo Transfer App that should do exactly as you want. Transferring from iPad to Windows.
Not sure I know the answer to why YouTube isn't taking it.
Solution 2:
You will get lots of answers since basically two things are conspiring to prevent you from grabbing the file.
The first is the iOS file size limit uploading to youtube. I don't have a hard limit, but it's been known for a while that past 5 minutes on most iOS devices, either the youtube API or the software declines to transfer a movie as a direct upload.
The second is likely a Windows filesize (or perhaps transfer software limitation) since iOS exposes the camera roll to computers as a camera DCIM folder. This means you can use your choice of transfer software to grab the movie when you connect it without needing iTunes or any other Apple help. Do you have any digital camera software that you could try? If not, simply head to the Apple support article that explains how to transfer these files by navigating directly to them when you connect your iPad.
iOS: Importing personal photos and videos from iOS devices to your computer
Also - check that your quicktime is updated and that you try transfering the file to an external drive with enough free space. This seems like something XP should be able to do as long as the destination drive is has a healthy filesystem and you're not exceeing any file size limits.