If you have mIRC installed somewhere such as c:\mirc\ and you put mirc.ini in your mirc.exe folder as was mentioned, then you'll only have to move a single folder.
* In XP or older, you can have it in c:\program files\mirc\ without a problem, but in Vista/7, you'll have to change the default permissions if you have it installed there and place mirc.ini in the same folder.
