optical mouse issues

hi! i recently bought a wired, fast optical mouse (800 cpi) because i'm tired of cleaning the ball of my previous mouse every now and then. at first, the optical mouse works fine but when i access other devices such dvd or cd rom, it gets disconnected. i have to unplug and plug it in to make it work again. but after a while it will be disconnected again. i experience the same problem whenever i play halo or other fps games. i already replaced my 300 Watts power supply with 450 watts because i thought 300 watt is already inadequate since my computer is fully loaded with so many peripherals. i'm sure there's nothing wrong with the optical mouse because i have tried it in other computers and works fine. need your help badly, thanks.

i've got an AMD XP 1900, Asus A7S333 MBoard, 512 MB DDR 333 (samsung), FX5700 128MB video card, Asus 32X24X32 CD-RW, Asus 16X DVD-rom, Creative external modem via serial port, bluetooth (usb), hpdeskjet(parallel), logitech webcam (usb), sound card (pci slot), data cable for olympus digicam(usb), and another data cable for casio digicam (usb). my OS is windows 2000 w/ SP6 and i think all my drivers are updated.

yes, i've tried it on ps2 and 3 different usb ports and i got the same experience