Graphics problem with bethesda games

[Monkeyuncle8]

I have been having a problem lately with bethesda games, whenever I press a key a little black bar appears at the corner of the screen, sometimes when I press the mouse rapidly the computer beeps, and the games have become increasingly slower and less responsive.

 

I have a Nvidia 8800 and its not the driver, because I have the most current for my card

 

Additional Details

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System Information

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Time of this report: 5/1/2010, 09:05:55

Machine name: SEWARD-DFF08535

Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_qfe.100216-2016)

Language: English (Regional Setting: English)

System Manufacturer: Dell Inc.

System Model: Dell DM061

BIOS: Phoenix ROM BIOS PLUS Version 1.10 2.0.4

Processor: Intel® Pentium® D CPU 2.80GHz (2 CPUs)

Memory: 3070MB RAM

Page File: 436MB used, 4008MB available

Windows Dir: C:\WINDOWS

DirectX Version: DirectX 9.0c (4.09.0000.0904)

DX Setup Parameters: Not found

DxDiag Version: 5.03.2600.2180 32bit Unicode

 

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Display Devices

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Card name: NVIDIA GeForce 8800 GT

Manufacturer: NVIDIA

Chip type: GeForce 8800 GT

DAC type: Integrated RAMDAC

Device Key: Enum\PCI\VEN_10DE&DEV_0611&SUBSYS_000000…

Display Memory: 512.0 MB

Current Mode: 1600 x 1200 (32 bit) (60Hz)

Monitor: Plug and Play Monitor

Monitor Max Res: 1600,1200

Driver Name: nv4_disp.dll

Driver Version: 6.14.0011.9745 (English)

DDI Version: 9 (or higher)

Driver Attributes: Final Retail

Driver Date/Size: 4/3/2010 18:55:31, 6432128 bytes

WHQL Logo'd: Yes

WHQL Date Stamp: n/a

VDD: n/a

Mini VDD: nv4_mini.sys

Mini VDD Date: 4/3/2010 18:55:31, 10232128 bytes

Device Identifier: {D7B71E3E-4551-11CF-A145-0B2003C2CB35}

Vendor ID: 0x10DE

Device ID: 0x0611

SubSys ID: 0x00000000

Revision ID: 0x00A2

Revision ID: 0x00A2

Video Accel: ModeMPEG2_C ModeMPEG2_D