Hello, I am using a Intel P4 on a Asus P4T motherboard with 512 Rimm. I have a pci usb2.0 card, and using 2 HD with different installations of Win XP (one general and another DAW installation) I am using a Behringer BCA2000 (USB 2.0). Everything worked just fine during 2 weeks(in both systems). After that i had to unplugged my unit from my PC (everything was turned off). Now the problems arose.. my unit(BCA2000) stop functioning. It gives me an error in system/devices it appears with an yellow exclamation point and it says: "This device cannot start. (Code 10)". It doesn't load up BCA control panel anymore.(i have no access to my unit neither in audio programs) Ok, so I decided and unplugged my unit.. uninstall all drivers... went thru my registry and erased all bca and behringer relative entries.. erased all my files in windows/system32 (etc). Reinstalled everyhting and all remains the same.. so.. i decided and i uninstalled everything relative to this unit.. i also unplugged my pci-usb2.0 card from my motherboard, plugged it again.. turned on my pc.. reinstalled everything from my bca's drivers and.. it remains the same.. so I formated my HD and made new clean installations of Win XP (both general and DAW). Then... i tried again.. i installed my drivers.. and guess what? Yes... it remained with problems. Also, and because i have already installed 3 times my S.O, i tried both ACPI and Non ACPI installations. None worked again. This unit worked for 2 weeks just fine... now.. it gives me that error. anyone has any idea? please? Thx in advance.