Sometimes I get this;

MIRC caused an invalid page fault in
module MIRC.EXE at 0197:0042b567.
Registers:
EAX=00000000 CS=0197 EIP=0042b567 EFLGS=00010246
EBX=00000000 SS=019f ESP=0081eef0 EBP=00f6fc28
ECX=c17a9de0 DS=019f ESI=00000003 FS=55af
EDX=0001dce4 ES=019f EDI=0081fb80 GS=0000
Bytes at CS:EIP:
39 9d 28 05 00 00 0f 85 be 00 00 00 8b 15 94 40
Stack dump:
0000801d 0081fb78 0081fbcc 7561443a 445b6874 68747561 21315d69 656f777e 65724069 65696e69 627a7372 65656865 65642e72 2e6e6f6d 50206c6e 20545241


What keeps making the problem?