Tried playing the new zombie map, call of dead, and when I go to play it starts loading, then says error content has changed..i've tried clearing the cache, deleting my profile, reloading it, redownloading the maps, deleting the retaliation map, deleted the update, redownloaded the update...with no luck.

If you ever happen to play multiplayer this will happen. Even with a friend on Xbox Live. But if you know you are alone the link below might help you better.
Cant play or use previously downloaded content on Xbox 360

no, your dvd drive has gone bad. to check if it is working or not your try to manually open the content of the cd and try copy on the hard drive. if it copies fine then the cd is good if not cd is bad. you might get a error message of bad sector or data randomization.
if it does not open at all the cd drive is bad. [email protected]

if you are not online than the scores dont register you have to be online in in a privote match with someone eles
hope this helps :)

Hello,
If you purchased the map pack, you still have to download it. This may take a while, since that particular map pack is 2.4 GB, which takes about 20 minutes to load. When that is done downloading, restart the game. If you don't, the game will play as if you didn't load the map pack. Remember to do that after you download the map pack.

Hope that helps. Good luck!!!

No you can't, you have to re-install World at War

Try updating your video card drivers. However, according to the specs, it's not supported for vista.

Vista site is equally unhelpful.

http://www.microsoft.com/Windows/compatibility/windows-vista/Details.aspx?type=Software&p=Blitzkrieg%20Anthology&v=CDV%20Software%20Entertainment&uid=&pf=36&pi=6&c=PC%20Gaming&sc=Strategy&vd=all&os=64-bit

Had a quick browser on the forums. Have you tried this vista dual-core patch?

http://bkpforums.com/phpBB2/viewtopic.php?f=58&t=3275&p=108961&hilit=screen+map+vista#p108961

Best of Luck

Give this a try:

Go to your Internet Browser on the PS3, open Options by hitting the Triangle button, then delete the Cache.

Try re-downloading the DLC. If it doesn't work, then return here and post a response. I'll be happy to assist you further.
Regards,

Aaron Busch

I;m getting this problem as well

Try to setup a private match and see if these new maps are on the list. Have you tried to play in a game mode with this problem?

redownload all maps and blow air into inside of xbox or clean disk and check for scratches. if that doesn't work you were either banned or need a new game data will be same disk might be ****.!!