I have Windows XP as my OS on both my desktop (Pro Version) and my notebook (Home version). For some strange reason, I also couldn't download video files on my desktop but could on my notebook. To get around it, I had to go back from WMP Version 10 to WMP Version 9 and I was able to download video files again. If you want to try this, following is the Microsoft instruction -
"To roll back from Windows Media Player 10 to a previous version, do the following:
In Control Panel (Category View), click Add or Remove Programs.
Click Remove a program, and then do one of the following:
If you are running Windows XP Service Pack 2, select the Show updates check box (at the top of the list), click Windows Media Player 10 (in the Windows Updates section), and then click Change/Remove.
- or -
If you are running Windows XP Service Pack 1 or earlier, click Windows Media Player 10, and then click Change/Remove'"