I'm using Mirc 6.2 with sysreset 2.53, my friend has the same and I used to send him stuff with DCC Send.
He recently updated to Windows 7 and now the sends are failing everytime, to my knowledge the only thing that has changed is his OS, his Norton firewall is the same and set up properly to allow traffic.
Neither of us know Windows 7 very well, so I wanted to ask what could be blocking our sends. (We also tried using newer versions, still the same issue)