Please increase your Buffer memeory for appalications.
Before you go for a preview. try to kill the exisitign process of adobe reader.
We need to see hte size of the XDP being generated.
If it is over 20 0r 30 MB, we may need to bring it down to 2 - 4 MB.
Again if the problem still persists, Re install the acrobat and try.
Lastly, check if the same problem happens when you use a adobe reader 8.1.3 or 9.4 (stable versions).