Image capture question

[ceo012384]

Quick question:

I am trying to capture some screen shots from a video.

I am running the video in windows media player, and I pause it where I want and press 'print screen'.

Then I paste it into mspaint, select the region I want, cut it out and make a new mspaint image with it.

Everything at this point is fine, I can save it as a bitmap and it looks good. However I want to make it a jpeg (to upload to photobucket, among other reasons).

When I save it as a jpeg the entire thing goes black. Or if I try to upload it as a bitmap to photobucket they convert it automatically (to jpeg I assume) and then it does the same thing, goes all black.

What's the deal and how do I fix it?