Well, what i did was just run the setup of mirc 6.31 and point it to my Program files\mIRC folder.
I also looked in the application data folder but there were no mIRC settings to be found, which should mean that all went well.

Now i tried the following:
I tried copying my setting files from an older backup which still had the previous install of mIRC.

There was no change at all it seems.

Anyone still have a clue? smile