Problems connecting - Vista/Norton 360

[andsoitgoes]

I'm trying to help out a friend who has an HTC phone (the S720, but the same thing happens if I plug my phone in) and it's been a pain in the ***

She has Norton 360 and ALSO had Windows Firewall running. Flipped off Windows Firewall, but the second I plug in her phone, the computer looks back at me and, well, says NOTHING.

If I have the device manager open, I can see it refreshing the devices, but nothing shows up.

I ASSUME it has something to do with 360 (stupid norton grumble) - but I haven't had much of a chance to kick it around.

Any preliminary thoughts on what the issue might be?

Thanks!!