in the end, it turned out to be a faulty video card.... i had it replaced and everything works fine now.. 
thank you all for your help
thank you all for your help
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My Computer
At a glance
Windows 7 Home Premium SP1 64-bitIntel™ Core™ i7 920 2.66 ghzOCZ 6gb (triple 2gb) ddr3-1333 (Gold Edition)Nvidia 9800 GT 1GB - x2 SLI
- OS
- Windows 7 Home Premium SP1 64-bit
- CPU
- Intel™ Core™ i7 920 2.66 ghz
- Motherboard
- Asus P6T Deluxe V2
- Memory
- OCZ 6gb (triple 2gb) ddr3-1333 (Gold Edition)
- Graphics Card(s)
- Nvidia 9800 GT 1GB - x2 SLI
- Sound Card
- On board
- Monitor(s) Displays
- 19" LCD Wide Screen / Built-in TV Tuner
- Screen Resolution
- 1440x900
- Hard Drives
- 250 GB Maxtor
+
1 TB Seagate
- PSU
- Corsair GX 800 (800watts)
- Case
- Thermaltake Level 10 GT
- Cooling
- Antec Kuhler 920
- Mouse
- CM Storm Sentinel Advanced
- Internet Speed
- 1MBps