BSOD randomly happening after installing SP1 WIN 7

Hi guys

i am recently experiencing BSOD issues ( don't remember the code cuz it happens even in idle mode when i'm not home )

so i installed WIN7 64 bit on an OEM Machine Fujitsu Siemens Amilo Desktop 3630P
has a Q8200 quad to core processor , 4 gb ram , 1 Zotac GTX 460 768 MB edition.

all went smooth till i upgraded to SP1 and had a BSOD on 4/09/2011 .. first attachment file .

then 2 days ago
it crashed on me while i was playing Rift ( notice i had zotac firestorm installed and vcard oc-ed to 800/1900/1600 )

then i rebooted and leave it with factory vcard 710/ 1800/1420 and it crashed again after 3 hours in idle mode . so i assume has nothign to do with overclock .


i don't have daemon tools installed cuz it's known it gives problems with sp1
also my win is totaly updated , same goes for drivers .

also i though might have somethign to do with energy issues ( i have a corsair 500W atx shoudln't be a problem) and in nvdia CP changed the energy management to full performance instead of adaptive.

also i dont' have any kind of energy save profile only monitor shutting down after 20 minutes .

still dont' get it why it happens maybe soem expert dump. file reader could give me a hand .. thank you

anyone managed to put an eye on the dumps ??

the system hasn't crash in the latests 10 hours , maybe because i keep the gpu cool and in factory settings , nut i want someone to confirm it, also i ran a sfc /scannow and it's all fine meaning no win errors .

ok so i had another crash today

from the event log all the crashes are Kernel Power event id 41 activity 63

i'll attach system spec and last dump file

crashes are intensifying .and all of them are coded Power Kernel ID 41 (63) ,what i did till now trying to fix it.

1. updated the chipset drivers for my nforce 630i /geforce 7100 .
2. i got a DRIVER IRQ_LESS_THAN_EQUAL error with usbohci.sys so i thought that i might have a faulty usb device . so unplugged all ( the kb , the xwinger usb mouse , and the usb port ) and let it idle for a bit .. it crashed after like 30 minutes . i even unplugged the front pannel usb card reader .
3. standing to some nvidia gtx460 users as me the 280.26 drivers where creating a power management issue . In fact one of the bsod was created by the nvdlkmkm.sys file. so i reverted to 275.33 drivers which i used for like 6 months with no problem . it crashed again.
4. i switched to the other OP win 7 32bit and had the same crash also . dunno what to do anymore . can someone look onto those dumps pls ??
the second minidump contains dumps from the 32 op crashes.