Don't knock your systems, til you see mine currently, seriously.
However, Quake 4 is playable enough that I completed single player, and HL2 and CS:S play pretty well too.
------------------
System Information
------------------
Time of this report: 1/13/2006, 20:04:46
Machine name: INETDAEMON
Operating System: Windows 2000 Professional (5.0, Build 2195) Service Pack 4
Language: English (Regional Setting: English)
System Manufacturer: n/a
System Model: n/a
BIOS: Default System BIOS
Processor: Intel Pentium III processor, ~700MHz
Memory: 576MB RAM
Page File: 151MB used, 771MB available
Windows Dir: C:\WINNT
DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
DxDiag Version: 5.03.0001.0904 32bit Unicode
---------------
Display Devices
---------------
Card name: NVIDIA GeForce4 Ti 4200
Manufacturer: NVIDIA
Chip type: GeForce4 Ti 4200
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_0253&SUBSYS_803B1043&REV_A2
Display Memory: 128.0 MB
Current Mode: 1152 x 864 (32 bit) (60Hz)
Monitor: Plug and Play Monitor
Monitor Max Res: 1600,1200
Driver Name: nv4_disp.dll
Driver Version: 6.14.0010.7801 (English)
DDI Version: 9 (or higher)
Driver Attributes: Final Retail
Driver Date/Size: 8/2/2005 15:35:00, 3908864 bytes
WHQL Logo'd: n/a
WHQL Date Stamp: n/a
VDD: n/a
Mini VDD: nv4_mini.sys
Mini VDD Date: 8/2/2005 15:35:00, 3198560 bytes
Device Identifier: {D7B71E3E-4113-11CF-8A6D-31A003C2CB35}
Vendor ID: 0x10DE
Device ID: 0x0253
SubSys ID: 0x803B1043
Revision ID: 0x00A2
Revision ID: 0x00A2
Video Accel: ModeMPEG2_A ModeMPEG2_B ModeMPEG2_C ModeMPEG2_D
-------------
Sound Devices
-------------
Description: SB Audigy Audio [E800]
Default Sound Playback: Yes
Default Voice Playback: Yes
Hardware ID: PCI\VEN_1102&DEV_0004&SUBSYS_00531102&REV_03
Manufacturer ID: 1
Product ID: 100
Type: WDM
Driver Name: ctaud2k.sys
Driver Version: 5.12.0001.0443 (English)
Driver Attributes: Final Retail
WHQL Logo'd: n/a
Date and Size: 2/23/2004 15:11:46, 366352 bytes
Other Files:
Driver Provider: Creative
HW Accel Level: Full
Cap Flags: 0x0
Min/Max Sample Rate: 0, 0
Static/Strm HW Mix Bufs: 0, 0
Static/Strm HW 3D Bufs: 0, 0
HW Memory: 0
Voice Management: Yes
EAX(tm) 2.0 Listen/Src: Yes, Yes
I3DL2(tm) Listen/Src: No, No
Sensaura(tm) ZoomFX(tm): No
Registry: OK
Sound Test Result: Not run
------------------------
Disk & DVD/CD-ROM Drives
------------------------
Drive: C:
Free Space: 2.2 GB
Total Space: 4.7 GB
File System: NTFS
Model: QUANTUM Bigfoot TX8.0AT
Drive: F:
Free Space: 2.5 GB
Total Space: 19.1 GB
File System: NTFS
Model: WDC WD200BB-00CAA1
Drive: D:
Model: _NEC CD-ROM CD-3002A
Driver: c:\winnt\system32\drivers\cdrom.sys, 5.00.2195.6655 (English), 6/19/2003 14:05:04, 27984 bytes
Drive: E:
Model: HL-DT-ST RW/DVD GCC-4522B
Driver: c:\winnt\system32\drivers\cdrom.sys, 5.00.2195.6655 (English), 6/19/2003 14:05:04, 27984 bytes