Ok, I have only 1 PC and I was wondering how many clients could I run with my setup? Here are my specs: (basically a eMachines W3615 with 1 more hard drive)

Windows XP Pro
Intel Pentium 4 3.0 GHz processor with Hyper Threading
160 GB SATA II and a 200GB IDA (the SATA has my OS on it and WoW installed)
1 GB DDR2 memory
Onboard Video Card, 128 MB shared RAM

Pretty much my hardware sucks... Anyone know of a place I can get a cheap but good PC? Or buy cheap parts? Also, how can I speed up performance?