Natural Selection 2 Fatal Error HELP

Hey guys, when I first played natural selection 2 it worked fine for about 5 minutes. Then I changed my screen resolution to 1280x1024 and it started to hang, coming out with a fatal error. When I changed it back to the original resolution, it still black screened and hanged whenever the precaching is done and i join the room. This fatal error is regarding the log.txt and minidump thingy. When i press the details for the log.txt this shows up in notepad
Date: 11/02/12
Time: 12:51:02
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Build 228
Steam initialized
Render Device: NVIDIA GeForce GTS 250 (6.14.13.623)
Sound Device: Realtek HD Audio output 5.1
Record Device: Realtek HD Audio Input
Loading config://ConsoleBindings.json
Loading config://FavoriteServers.json
Main Menu Initialized at Version: 228
Connecting to server 216.185.114.85:27415
Client : 0.000000 : Loading VM Client
Loading config://ConsoleBindings.json
Loading config://FavoriteServers.json
Loading 'maps/ns2_veil.level'
Error: Couldn't open file ''
Error: Couldn't load 'materials/descent/descent_floor_01_a_normal.dds' (File not found)
Finished loading 'maps/ns2_veil.level'
Predict : 0.000000 : Loading VM Predict
Error: IDirect3DDevice9::CreateTexture(2048x1024, 12, D3DFMT_DXT1) failed (Out of video memory)
Error: Couldn't load 'models/props/refinery/docking_curvewall_02_clean.dds' (invalid format)
Error: IDirect3DDevice9::CreateTexture(2048x1024, 12, D3DFMT_DXT1) failed (Out of video memory)
Error: Couldn't load 'models/props/refinery/docking_curvewall_02_normal.dds' (invalid format)
Error: IDirect3DDevice9::CreateTexture(2048x1024, 12, D3DFMT_DXT1) failed (Out of video memory)
Error: Couldn't load 'models/props/refinery/docking_walltech_01.dds' (invalid format)
Error: IDirect3DDevice9::CreateTexture(2048x1024, 12, D3DFMT_DXT1) failed (Out of video memory)
Error: Couldn't load 'models/props/refinery/docking_walltech_01_normal.dds' (invalid format)
Error: IDirect3DDevice9::CreateTexture(1024x512, 11, D3DFMT_DXT5) failed (Out of video memory)
Error: Couldn't load 'models/props/refinery/docking_walltech_01_spec.dds' (invalid format)
Error: IDirect3DDevice9::CreateTexture(1024x512, 11, D3DFMT_DXT1) failed (Out of video memory)
Error: Couldn't load 'models/props/refinery/docking_walltech_01_illum.dds' (invalid format)
Error: IDirect3DDevice9::CreateTexture(2048x1024, 12, D3DFMT_DXT1) failed (Out of video memory)
Error: Couldn't load 'models/props/refinery/docking_bigtubes_01.dds' (invalid format)
Error: IDirect3DDevice9::CreateTexture(2048x1024, 12, D3DFMT_DXT1) failed (Out of video memory)
Error: Couldn't load 'models/props/refinery/docking_bigtubes_01_normal.dds' (invalid format)
Error: IDirect3DDevice9::CreateTexture(1024x512, 11, D3DFMT_DXT5) failed (Out of video memory)
Error: Couldn't load 'models/props/refinery/docking_bigtubes_01_spec.dds' (invalid format)
Error: IDirect3DDevice9::CreateVertexBuffer 147280 bytes failed (Out of video memory)

nothing happens when i press details for the minidump.
Really thanks for any help rendered =P I really wanna play natural selection 2 =P