g15 being retarded

So, i have a brand new G15 gaming keyboard. the first time i used it, it worked great. this was on my laptop though. When i hook it up to my desktop, every time it gets to the windows logo and blue loading bar thing, my pc reboots and it constantly loops this process until i unplug the keyboard and put in my old dell ps/2 board. This is really pissing me off because it works on my laptop, which is way worse than my desktop. my specs are:
Seagate 320gb HDD with perp recordind
1gb corsair ram (2x512)
AsRock 939 Dual-Sata2
Antec 400w psu
nVidia 6600LE PCIE gc
Sony lightscribe dvd burner
AMD Athlon 64 3200+ @ 2.51ghz
XP Pro SP2

Now, my laptop and desktop are all up to date, and were formattedw ith hte same XP Pro disk, and even the same SP2 disk. Both the desktop and laptop have hte most current g15 software (1.3.something) There is a setting in my BIOS called Legacy USB support, and ive left that to auto figuring if it hated it, it wouldnt enable it. I have no idea what this is for, so its gone untouched.

i hope your fucking kidding me. the problem was a piece of shit asrock mobo. now that i roll with Asus, a lot of hardware problesm have seemed to vanish.