Gamer problem hjææælp

Hej, jeg har et stort problem med min gamer pc. efter et par minutters spil, bliver skærmen helt sort, og der står dvi. som om skærmen slukker. Efter et par sekunder går den ind i spillet igen. det gør den cirka 3 gange på 10 min... efter to gange, bliver skærmen sort, så går den til skrivebordet og så ind i sspillet. nogle gange står der at Nvidia driveren ikke svarede, men forbindelsen nu er genoprettet.
mit motherboards, lydkorts, og graffikkorts drivere er helt fuldt opdaterede med drivere.

mine specs:
Operating System new - server roles  System Model
Windows 7 Home Premium (x64) (build 7600)
Install Language: Dansk (Danmark)
System Locale: Dansk (Danmark)
Installed: 04-02-2011 18:32:39  Gigabyte Technology Co., Ltd. P43-ES3G
Enclosure Type: Desktop
Processor a  Main Circuit Board b
2,85 gigahertz Intel Core2 Quad Q9550
64 kilobyte primary memory cache
6144 kilobyte secondary memory cache
64-bit ready
Multi-core (4 total)
Not hyper-threaded  Board: Gigabyte Technology Co., Ltd. P43-ES3G
Bus Clock: 333 megahertz
BIOS: Award Software International, Inc. F8 05/08/2009
new USB Storage Use in past 30 Days (mouse over last used for details)  new Hosted Virtual Machines (mouse over name for details)
  Last Used
Generic Storage Device -- drive 1, s/n 15C3DE86BB08C8, rev 8.07 20-05-2011 17:33:54
Apple iPod, s/n 000A27001533B19E, rev 1.62 19-05-2011 20:38:30*
KINGSTON DT 100 G2, s/n 001CC0EC345CAAA055C42D60, rev 1.00 12-05-2011 21:08:51*
Kingston DataTraveler G3, s/n 001CC0EC2F1CF080660413CC, rev 1.00 04-05-2011 19:11:00*
HUAWEI SD Storage, rev 2.31 25-04-2011 21:38:48*


* Possibly used again before the reboot following this time.  None discovered
Drives new - drive encryption  Memory Modules c,d
1000,19 Gigabytes Usable Hard Drive Capacity
717,14 Gigabytes Hard Drive Free Space

Optiarc DVD RW AD-5240S ATA Device [Optical drive]

Hitachi HDT721010SLA360 [Hard drive] (1000,20 GB) -- drive 0, s/n STF607MS0758EK, rev ST6OA3AA, SMART Status: Healthy
USB Device [Hard drive] (1,93 GB) -- drive 1, s/n   8192 Megabytes Usable Installed Memory

Slot 'A0' has 2048 MB
Slot 'A1' has 2048 MB
Slot 'A2' has 2048 MB
Slot 'A3' has 2048 MB
  Local Drive Volumes new - volume encryption
     
c: (NTFS on drive 0) 1000,19 GB 717,14 GB free 

  Network Drives
  None discovered
Users (mouse over user name for details)  Printers
local user accounts last logon
Carl 20-05-2011 11:50:04 (admin)
Gæst 22-04-2011 16:16:05 
UpdatusUser 20-05-2011 11:46:57 
local system accounts
Administrator 14-07-2009 07:08:59 (admin)
ASPNET never 


Marks a disabled account;    Marks a locked account    Microsoft Shared Fax Driver on SHRFAX:
Microsoft XPS Document Writer on XPSPort:

Controllers  Display
ATA Channel 0 [Controller] (3x)
ATA Channel 1 [Controller] (3x)
Intel(R) ICH10 Family 2 port Serial ATA Storage Controller 2 - 3A26
Intel(R) ICH10 Family 4 port Serial ATA Storage Controller 1 - 3A20
Standard Dual Channel PCI IDE-controller  NVIDIA GeForce GTX 275 [Display adapter]
Iiyama PL2209HD [Monitor] (21,7"vis, s/n 11008M9605076, juni 2009)
Bus Adapters  Multimedia
HUAWEI Mobile Connect - Bus Enumerate Device
Intel(R) ICH10 Family USB Enhanced Host Controller - 3A3A
Intel(R) ICH10 Family USB Enhanced Host Controller - 3A3C
Intel(R) ICH10 Family USB Universal Host Controller - 3A34
Intel(R) ICH10 Family USB Universal Host Controller - 3A35
Intel(R) ICH10 Family USB Universal Host Controller - 3A36
Intel(R) ICH10 Family USB Universal Host Controller - 3A37
Intel(R) ICH10 Family USB Universal Host Controller - 3A38
Intel(R) ICH10 Family USB Universal Host Controller - 3A39  Enheden High Definition Audio
Virus Protection [Back to Top]  Group Policies
Microsoft Security Essentials Version 3.0.8107.0
    Scan Engine Version 1.1.6903.0
    Virus Definitions Version 1.105.32.0
    Realtime File Scanning On
AVG Anti-Virus Free Edition 2011
  None discovered
Communications new - connection speed & status  Other Devices
 
Microsoft 6to4-netværkskort
Microsoft ISATAP-netværkskort
↓ Microsoft Virtual WiFi Miniport Adapter
Status:  Not connected to a network
Dhcp Server:  none responded 
Physical Address:  00:1E:2A:E8:22:E7
↑ NETGEAR WG111v2 54Mbps Wireless USB 2.0 Adapter
primary  Auto IP Address:  192.168.2.3 / 24
Gateway:  192.168.2.1
Dhcp Server:  192.168.2.1
Physical Address:  00:1E:2A:E8:22:E7
Connection Speed:  18 Mbps
↓ Realtek RTL8168C(P)/8111C(P) Family PCI-E Gigabit Ethernet NIC (NDIS 6.20)
Status:  Cable unplugged
Dhcp Server:  none responded 
Physical Address:  00:24:1D:84:36:FC
Teredo Tunneling Pseudo-Interface
 
Networking Dns Servers:  192.168.2.1
195.184.96.2
213.173.225.86
  HID-kompatibel brugerkontrolenhed (2x)
HID-kompatibel enhed
USB-inputenhed (2x)
HID-tastaturenhed [Keyboard]
HID-kompatibel mus [Mouse]
USB-lagerenhed
USB-rodhub (8x)
USB-sammensat enhed
Øjebliksbillede af lagerenhed
E:\






problemet opstår under alle spil...