The latest test results: I installed Win 7 Pro 32-bit on an older machine [P4-3.2ghz, 1-gig ram, 160 gig IDE drive, Intel MB/chipset]. Doing the same test, copying a 50 gig folder full of files from an XP peer I get the same error, 0x8007046a: Not enough server storage is available to process this command." Ok, this eliminates the NVidia chipset as being the culprit, and lends some credence to Jay's comment that Win7/Vista does not "play nice" with other OS's. Next, I'd like to test two Win7 machines, peer to peer to confirm this, but since I can't get freaking test folder onto either Win7 machine, I'll have to install XP again on one of them [sigh]. Thanks to everyone for their comments. Ken.C