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How to Setup Dual Monitors in Windows 7
Check out this one... It has step by step information
How to Setup Dual Monitors in Windows 7
Check out this one... It has step by step information
Unless the DVI port for the onboard video is a DVI-D (D for dual) port, then the best you're going to get using a DVI splitter is cloned or mirrored displays.
The computers at work are most likely using a card something like this,
Newegg.com - ATI 100-505139 FireMV 2200 64MB DDR PCI Low Profile Workstation Video Card
that has a DVI-D port, which when used with the included splitter cable can display to two monitors in extended mode.