Not sure what it could be..need help!

Hi, I just recently purchased an XFX 5770 and everything works great when playing games like Crysis, Mass Effect, Empire: Total War, etc..there has been only one problem. The screen seems to get clear lines running across the screen when explosions, multiple people are firing at me, and mostly when the video on Mass Effect is moving around at a fast pace..what could be causing this problem???

I keep thinking that it could be my monitor..what do y'all think? the monitor is an HP 2009m 1600x900 60hz

if you need more info, let me know!

System specs:
AMD Phenom II X4 965 Black Edition Deneb 3.4GHz 4 x 512KB L2 Cache 6MB L3 Cache Socket AM3 140W Quad-Core Processor
9 GB RAM PC3-10600 MB/sec
750 GB SATA 3G (3.0 Gb/sec) 7200 rpm
XFX Radeon HD 5770 1GB 128-bit DDR5 PCI Express 2.1 x16
1 Aerocool SilverLightning 140mm Case Fan
1 COOLER MASTER 120mm Blue LED Case Fan
1 COOLER MASTER Blade Master 92mm Case Fan
Corsair 550VX Power Supply
Windows 7 Home Premium 64-bit
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More about need help
  1. try reinstallin drivers wid the latest one....
    use driver sweeper wen u remove ur old drivers...
    and also wat r the fps u get while playin?
  2. how do you do a "driver sweeper?"

    I get pretty good fps, between 30-45 on crysis and on mass effect about 60+
  3. http://downloads.guru3d.com/Guru3D---Driver-Sweeper-(Setup)_d1655.html
    use this make sure u boot into safe mode and remove the registry entries wid it...
  4. ok. will do thanks
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