Hi,
There is a bug in SMB2 in Vista, there is a patch available see:- http://support.microsoft.com/kb/935366/en-us

>It is my development machine, and hangs for 30 ro 120 seconds everytime it accesses the file system. I probably spend 1/4 to 1/3 of my day waiting for it. I backed up my data to my laptop over the weekend (and still am). So far it has taken 5 days to copy 40 to 50 gigs. This problem is killing my productive and frustrating to no ends.