It's likely not "bytverity.c" but "bytverify.c"...
Anyway, viruslist.com gave me no enlighting details whether or not this class loader (?) is connected to your mIRC problem.
I say "is", as deleting a trojan found does not mean you got definitely rid of it (or the things it did so far) - it only means that you got rid of what has been found so far. (This is a general remark, as I often deal with users who forget that there might always be (or remain) more than what they - or their anti-malware programs - see. The only chance to have a
doubtless and 100% clean system is to make a clean OS install of a demonstrably secure source, using only demonstrably secure software, and never getting online or plug/insert any external devices - which is most unlikely
)
Do the servers provide no further information about what kind of infection causes their warning?
Read
this link as a starting point; but I highly recommend to post your problem and log at a specialized hijackthis support forum, e.g.
here .