How about some specs?
Windows+R, type in dxdiag, and hit enter.
Post what is on the "System" and "Display" tabs; both computers if possible.
DISPLAYtotal memory: 64 MB
Chip type: ATI Radeon XPRESS 200 Series (0x5974)
DAC type: Internal DAC (400 mhz)
Plug and Play monitor.
Main driver: ati2vdag.dll
Version: 6.14.0010.6587 (english)
Date:12/31/2002 8:00:00
WHQL Logo'd :yes
Mini VDD: ati2mtag.sys
DDI Version: 9 (or higher)
SYSTEM INFOMicrosoft Windows XP Professional (5,1 Build 2600)
System model: HP Compaq dc5750 Small form factor
BIOS: Default system BIOS
Processor: AMD Semptron(tm) Processor 3400+ MMX, 3Dnow, ~1.8 Ghz
Memory: 446MB RAM
Page file: 430MB used, 869MB available
DirectX version: 9.0c (4.09.0000.0904)