I accidentally fell on my keyboard and now everything on my moniter is upside down.My desktop, everything. I turned my moniter upside down so I would be able ,hopefully,to get some help.

Vista, Try control/alternate/up or down arrow at the same time.
On XP, right click your Desktop, click Graphics Options, select rotation, 90, 180, 270.

I have windows 7 and somehow everything just went upside down my son hit something