when I copy data to my external hard drive in win7 my system freezes and then I get the bsod. This drive worked fine in vista but it wont work now can anyone shed any light on this any help at all would be greatly appreciated thanks
Format your External HDD. If there is still a problem you need to wipe your internal drive and reinstall windows.
I had a problem with bsod's copying files after upgrading from xp to win7 took me days to work out what the problem was. Swapped the memory from geil to corsair problem disappeared.
what is the BSOD? If it blue screens then give us the text of the BSOD. The BSOD isn't just something generic it contains specific information about why the computer crashed.