Usb Devices stopping windows from booting

[Andyuk2007]

Hey all, I had this really weird problem today at one of my call outs and i wanted to share it with you in the hope of a solution.

A woman's computer wouldnt boot into windows xp so i did the usual boot repair options, then i decided to unplug all her usb devices and plug my ps2 keyboard in and the computer booted into windows with no problems.

I wanted to see why that was so i plugged her usb mouse back in and rebooted, windows failed to post or anything, i did clear the cmos but this still didnt fix the problem. So i tried my ps2 mouse and keyboard again and it worked every time that was plugged in.

Has anyone ever come accross this issue and how did you resolve it ?