Bans often last 24-48 hours. Unless you are able to contact the network for help getting it removed sooner, you'll have to wait. You can try going to the network's website and look for contact information there. They may be willing to remove it sooner if you talk to them.
In the future, you should be careful about doing what people on IRC tell you. That's a good way to get not just banned, but viruses and trojans.