Everytime I try to log on I keep getting disconnected. Any help?

What is the reason you get disconnected?
The reason is often shown in the status window.

Make sure you try using the Search feature, it may have been answered before (highly likely). Make sure you expand to 'All Forums' and 'All Posts' for best results. Common connection issues and an explanation can be found in this thread. If you're experiencing 'Software caused connection abort', which is one of the most common errors to receive, then check out this thread.

If you find you are 'G-lined' or 'K-lined' or 'AutoKilled', it means you are banned from that particular network and it has nothing to do with mIRC. See this thread.