Google's your friend young fella
I have a retail program that will do it but I just Googled for you and found this...
Go to Windows Movie Maker. Drag or open your video thats showing upsidedown into Movie Maker. Then drag the file down to the storyboard line at the bottom. Right click the thumbnail for the video select EFFECTS. Select MIRROR VERTICAL. Now do file/publish select make a DVD and you will be taken into DVD maker where the video will be RIGHT SIDE UP. Voila ;-)
I can't verify it for you but........
