"Location not available"

Hey all,

So after doing a complete partition image backup, I am on my new machine and attempting to access my backed up data. I can mount the partitions as drives, but when attempting to access a few folders I get " Location Not available: J:\Music refers to a location that is not available...." [see attaches screenshot]
Not all of the folders give me this error. Also, when just browsing in explorer to the image and browsing the image, I can get in all the folders and see the data like .mp3s for example. I can only copy a certain amount at a time otherwise explorer times out and only a few files are copied over.

Windows 7 x64
Acronis True Image 2010