Upside down picture while viewing DVD movies!!

Hello. I'm not sure if I'm posting this in the correct forum or not..Hope someone can help, cuz its making me nuts! First my vitals: I have a Dell Optiplex 745 computer and running Windows XP Prof. SP3. I've not been able to watch a DVD movie thru Wind. Media Plyr (11), as it tells me I'm missing the 'codecs' needed to do so. I downloaded a program a family member uses, as I found it to be simple and it WORKED. That programs website is MediaCodec.org and is also referred to as, "Windows Essential Codec Pack", or Media Player Classic-Home Edition 1.4. The download seemed to work until a DVD is put in drive. The picture/movie starts just fine, but the picture is UPSIDE DOWN! Any ideas where I went wrong or what I can do to correct this? I find their website to be kind of vague as far as 'help' of sorts goes...Thanks for your suggestions.