As the above says, there is no mIRC 6.13. If you have installed an mIRC 6.13 (and it's not just a typo) then that is a virus. See
this thread. Also, make sure you only EVER get mIRC from
http://www.mirc.com/get.html - any other page is NOT official.
If it definitely is 6.13 you downloaded and installed, then it's a virus which must be cleaned immediately. See
this post and also
http://www.mirc.co.uk/help/virus.html for further assistance.
There are known problems with SysReset and mIRC versions 6.12, and possibly 6.14 too. As far as I have seen the problem is that it causes DCC issues, but it could also be the cause of your problem too. Try uninstalling that script and seeing if that helps.
You may also want to make sure you have all the most current
Windows updates and clean out whatever folder you're saving the files to.
G'luck!
Regards,