Do you have any other software firewall? Nortion Internet Security?
The default settings on windows will allow mIRC to connect. Just make sure you added it to the exception list in the Windows firewal and on the exception list of any other firewall.
Also, how are you connecting to the internet? Regular Cable/DSL connection, or are you on a university/schoo's internet?
Its a frigging Laptop, not a Labtop!!!!