I think the specs are actually quite low for running it on low ofcourse.
System requirements
Minimum System Requirements[1]
750 MB hard disk space
2 GHz processor
Windows XP or higher
1 GB RAM
Any DirectX 9.0 capable video card
Recommended System Requirements[1]
750 MB hard disk space
Windows XP or higher
3 GHz processor
1 GB RAM
GeForce 8800 or equivalent video card
Found on the wikipedia page, hope that helps.
/Czeldabolg