...and McAfee reported me that it detected a file called Generic PUP.J. I've re-dl'd the .exe file from other mirrors and re-intalled it and I still get the same warning, is this normal for installing mIRC?

Than you for answering my question.

That could either be a false positive or it could be that the version of mIRC installer has been repackaged with malware, depending on where you downloaded the installer from.

Considering the nature of the problem, I strongly recommend that you follow CastleCops' Malware Removal and Prevention procedure, a system CastleCops devised to enable users to either partially, or fully clean their systems without the direct aid of an expert.

Please read these instructions carefully. You will find the Malware Removal and Prevention Procedure here:

http://wiki.castlecops.com/Malware_Removal_and_Prevention:_Introduction

If that doesn't fix the problem, then go to this Forum, read the instructions at the top of the page carefully:

/f67-Hijackthis_Spyware_Viruses_Worms_Trojans_Oh_My.html

Follow these instructions:

/t102301-Hijackthis_Guidelines_Read_Before_Posting.html

and one of CC's trained 1st Responders or Security Experts will help you.

Note: You must be a CastleCops member to post for help in the HJT forum.