Windows 7: Need Help WIN7 professional 64 Freezing at random times

I have a new PC witch is freezing at random some times in 5 minut some times in 2 days i dont know if it is a hardware or a software problem ther is no BSOD or error just stosp it dosnt react at all have to make a reset. Can some one help ?? Pleas!!

Hardware:

CPU: Intel Core i7-2600 (Sandy Bridge-DT, D2)
3400 MHz (34.00x100.0) @ 3410 MHz (34.00x100.3)
Motherboard: ASUS P8P67-M
Chipset: Intel P67 (Cougar Point) [B3]
Memory: 8192 MBytes @ 668 MHz, 9.0-9-9-24
- 4096 MB PC10600 DDR3 SDRAM - Team Group Team--Elite-1333
- 4096 MB PC10600 DDR3 SDRAM - Team Group Team--Elite-1333
Graphics: nVIDIA GeForce GTX 460 (GF104)
nVIDIA GeForce GTX 460 (GF104), 1024 MB GDDR5 SDRAM
Drive: ST2000DL003-9VT166, 1953.5 GB, Serial ATA 6Gb/s
Drive: Optiarc DVD RW AD-5260S, DVD+R DL
Drive: DVDFab Virtual Drive, BD-ROM
Sound: Intel Cougar Point PCH - High Definition Audio Controller [B3]
Sound: nVIDIA GF104 - High Definition Audio Controller
Network: RealTek Semiconductor RTL8168/8111 PCI-E Gigabit Ethernet NIC
OS: Microsoft Windows 7 Professional (x64) Build 7601

check your NIC drivers and chipset are fully up to date ?

Also take a look for clues in reliability monitor and event viewer errors also including the windows logs ?

yes the network interface card drivers and chipset are up to date. I also have look for clues in reliability monitor and event viewer errors also including the windows logs and there is nothing just one critical error windows wast stop correctly because i had to restart it.

I also run the stress test for the CPU an RAM and was no error is there a posebility that there is some configuration in BIOS wrong ?

unlikely , although at first look it presents like a hardware issue ?

what is your power supply make model and age ?

As your computer is new, it'll pay you contact your reseller for some support.

It should have a warranty and you might as well make use of it to either have your computer repaired or replaced.

The power supply is

Rasurbo Silent & Power 650W

Technical Details

• Powerful design with enclosure varnished in black
• 650 watts of output power
• 20+4-pin ATX combo connector
• ATX 12 V version 2.2
• S-ATA connector
• PCI-E connector (6/6+2-pin)
• Extremely silent 120 mm fan, 17 dB(A)
• Automatically adjusted fan speed
• Power factor correction (PFC) filter
• Overvoltage protection (OVP)
• Overpower protection (OPP)
• Short-circuit protection
• On / off switch
• Retail packaging in two languages
• CE-certified
• 24 months of warranty
• Power cord included

And is its a costume made PC witch should work.