how do i set defaults on any program, i need to do it on mirc?

There is no standard way to set defaults on programs/ They are all different, even for Microsoft products.

RE: MIRC I went to http://www.mirc.com/ and looked around and found the following. You did not say your operating system so you need to figure it out for yourself. But you need to dlete the settings file in the MIRC folder whereever it is located depending on your OS.

Info follows:

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Full Vista compatability, among others, means that new installations of mIRC now save all settings in the User's "Application Data\mIRC" folder by default. However, if the installer or mIRC find an old installation with a mirc.ini in the same folder as mirc.exe they will use the mirc.exe folder for all settings. If you are installing a new mIRC over an old version you should see no change in behaviour. The installer is now also aware of administrator and standard user accounts and installs mIRC accordingly. Under an Administrator account, the installer will create icons for "All Users". Under a Standard account, it will create icons only for the current user. When run under Vista mIRC now checks for a corresponding virtual store folder at startup. Vista creates virtual store folders for older non-Vista compatible applications, such as older versions of mIRC. If mIRC finds such a folder, it displays a dialog box allowing you to retrieve your old mIRC files and settings.