Firstly - why post on here? Wouldn't the Satdrive forums be a better place to post and you would have a lot more chance of one of the other users replying
Secondly - I use MIRC and I believe it only supports Socks 5 and the Satdrive proxy is Socks 4, hence the problem. I think people have got VisualIRC working fine over it so ask around on there - it's not something I use a lot.