I have a Dell Inspiron 5100 laptop and I'm having an issue installing Windows XP. When I try to format the partition it completes but soon after I get stop errors: driver_irq_not_less_or_equal. This comes up every time. The CD is good. I've tried installing on the original hard drive and two new hard drives that Dell sent me. Now I'm thinking it's the motherboard but when I called Dell they said that it's a hard drive because when I remove the hard drive and try to install the CD it goes through the whole setup. I'm a little confused and don't know what the bad part is. Any help would be appreciated.