Problem signature:
 Problem Event Name:	APPCRASH
 Application Name:	iw3mp.exe
 Application Version:	0.0.0.0
 Application Timestamp:	4859a219
 Fault Module Name:	pbcl.dll
 Fault Module Version:	0.0.0.0
 Fault Module Timestamp:	50522bb2
 Exception Code:	c0000005
 Exception Offset:	000d8f53
 OS Version:	6.2.9200.2.0.0.256.48
 Locale ID:	1055
 Additional Information 1:	5861
 Additional Information 2:	5861822e1919d7c014bbb064c64908b2
 Additional Information 3:	dac6
 Additional Information 4:	dac6c2650fa14dd558bd9f448e23afd1

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as you can see i have problem with cod4 and its punkbuster with this. cant fix it...

DId you try reinstalling PB?

go on evenbalance.com and download pbsvc.exe, update your punkbuster and it should stop crashing.