i was wandering what an acceptable error rate is when using asicminer usb erupters

i recently bought 9 erupter miners and a "tecknet" powerd usb hub. but here is the problem all the miners and the hub works fine on my main rig it recognizes all of them, but on my mining computer i alocated for it the miners are not being recognized when i put them in the usb hub but they are seen when i just put them in one of the mobo usb ports it works just fine with bitminter but i dont think the hub is broken because when i just put a usb drive in the hub win just sees it without a problem but i can not get them to work on there BUT here is the wierd thing if i put a non powerd hub on my powerd hub and then a miner on the non powerd one it works fine so i think it is driver related but i have no idea how to fix it so i hope you guys can help me