I had the error messages with ver 7.0 before I installed sp1
Just before I installed sp1 Adobe told me that ver 8.0 was out and asked if I wanted it so I did.
Then installed sp1 and all is well.
I knew that vista didnt really like Acrobat7.0 but I had no trouble with it and I used it many many times. I think it may have just been a "Not Certified" issue.
I will say 8.0 has a nicer interface.