i got a inspiron 5100 and i get no boot device available-cardbus nic boot failed.i get 2 others.  broadcom undi,pxe-2.1     also i get intel base-code,pxe-2.1 this is where i get pxe-e61:media test failure,check cables      pxe-mof:exiting broadcom pxe rom.....please help what is this.it all started when i got firefox addon for G-MAIL...and it froze so i turned it off then started up and went to try to remove out of programs then froze again so i tried reinstalling xp home os and cant do that.what do i do