Hi CMCF,
The culprit of your friend's PC is ZoneAlarm. Probably ZoneAlarm is conflict with some of software at your friend's PC such as eMule and etc. De-install or upgrade ZoneAlarm may resolve the problem.
The stack trace of the minidumps.
ChildEBP RetAddr Args to Child
f3873ce4 8054b0b9 00000070 00000000 f3873d44 nt!ExFreePoolWithTag+0x237 (FPO: [Non-Fpo])
f3873cf4 f6a4d410 00000070 02ecf0bc f6a22899 nt!ExFreePool+0xf (FPO: [Non-Fpo])
WARNING: Stack unwind information not available. Following frames may be wrong.
f3873d44 804de7ec 02ecf100 00010080 02ecf0bc vsdatant+0x43410 <-- ZA
f3873d44 7c90eb94 02ecf100 00010080 02ecf0bc nt!KiFastCallEntry+0xf8 (FPO: [0,0] TrapFrame @ f3873d64)
02ecf08c 00000000 00000000 00000000 00000000 0x7c90eb94