New PC with Blue screen

A frind has built a new pc with win 7 x64 premium.
Occasionaly it blue screens. Below comes from event viewer.

X64_0x50_nt!IoRemoveIoCompletion+f9
0
BlueScreen
Not available
0










C:\Windows\Minidump\091110-26691-01.dmp C:\Users\John\AppData\Local\Temp\WER-56612-0.sysdata.xml C:\Users\John\AppData\Local\Temp\WERFB10.tmp.WERInternalMetadata.xml
C:\Users\John\AppData\Local\Microsoft\Windows\WER\ReportArchive\Kernel_0_0_cab_09db0147
X64_0x50_nt!IoRemoveIoCompletion+f9
0
091110-26691-01

This is another one.
services.exe
6.1.7600.16385
4a5bc10e
services.exe
6.1.7600.16385
4a5bc10e
c0000005
00000000000029db


C:\Windows\Temp\WERB063.tmp.appcompat.txt C:\Windows\Temp\WERB0D1.tmp.WERInternalMetadata.xml C:\Windows\Temp\WERB0D2.tmp.WERDataCollectionFailure.txt
C:\ProgramData\Microsoft\Windows\WER\ReportQueue\AppCrash_services.exe_ec4b61257bd3f4e0fb5d754bc9b1787e38cb156f_cab_09b0b0d0

0
77f28099-bcd9-11df-8bd5-6cf049da8ac2
4


0

Any ideas?

BlueScreenView may give some additional info about the crashes.

http://www.nirsoft.net/utils/blue_screen_view.html

I'd try testing the memory and hard drive also.