I installed yesterday the trial version of the CS6 Master Edition on two computers and the photoshop doesn't work on none of them.
Both computer is running Windows 7 Ultimate 64bits.
The message appearing is like that:
"Could not open a scratch file as the file is locked, it is not necessary to have access permissions or another program using the file. Use the command "Properties" in Windows Explorer to unlock the file" (translated from portuguese, not well writter even in portuguese...)
the question: what file is that? where to find them?
other issue identified, the uninstal of CS6 Master Edition blocks the alteration on the Photoshop.
Are the computers on a network?
Where is the My Documents folder located?
Can you look over this FAQ Entry, and provide all the info requested? http://forums.adobe.com/message/4587299#4587299
the computers are connected at the same router, but not sharing files, there is no network between the computers;
in both computers the Users folder is in a partition different of the system partition (D:/Users);
I had the same issue but I found a solution.
Hope this was helpful...