Dvds and video files wont play after Powerdvd Upgrade

I upgraded from Powerdvd 5 to Powerdvd 7. Now after I restarted my computer. None of my dvds will play on the player. The application crashes. I then noticed none of my mpeg and avi files wont play in wmp 11. I uninstalled Powerdvd and wmp 11 and reinstalled my copy of powerdvd 5 and wmp 10 and still nothing. Also, when i open my movie folder i can usually see a picture of the start of the file, but instead it shows the application icon for that file. Any help would be appreciated.

I uninstalled defilerpak. Restarted and then install k-lite. While it was installing i get an error message "unable to register the dll/ocx: dllregisterserves failed: code 0x80040154 class not registered."

After mmore research, i found an windows app that list what mpeg 2 codecs are installed and know was showed up. SO yes it is a codec thing but why wont they install.?

The options it gives me is retry ignore or abort. Also, I can't even do a system restore. I tried multiple days but nothing.

I think when I was trying to install it over and over i clicked ignore. And it gave the same problem. Last niight I had some time and I figured the problem had to do with the registry and didn't feel like wasting more time on it so I reinstalled windows. its working now. Thanks for your help. I know have klite installed since my codec pack , defilerpak, hasnt been updated since dec 2005.

I backed up my computer first only had afewthings and i also wanted to reinstall soon anyways. I didn't know you could just copy the files over manually.

Do you happen to know why my system restore wont work. It didnt work beforeI reinstalled and now its doing the same thing not letting me restore to a different day.

There are multiple restore points from when i have installed some items. I manually created one and tried to restore to that time but nothing. I think booted into safemode and it worked for teh one i created but for none of the others.