Here I am using Windows 10 PRO, version 1703, build 15063.138 and mIRC is opening normally with version 7.48.
I recommend you do a clean boot of Windows, to determine if any program is causing conflict and generating this error.
A friend who was having problems with certain programs after updating Windows, and the cause of the problem was an incompatibility of the version he was using from Riva Tunner Statistics Server.
