Without all the hoopla....
Alt +Print Screen
Start>>All Accessories>>Paint>>click Edit in toolbar>>click Paste>>
click File in toolbar>>click Save As
Save to My Pictures as .jpg--.jpeg format
Ready to host.... open
www.imageshack.us
Browse, find photo>>click Resize Image?>>640 X 480>>click Host It
copy/paste 4th or 5th URL (Hot Link for Forums) into your post and you're done!