I second DarkStar...go to the bios and disable there. Boot up and carefully watch...it will say something like "press DELETE (or F2) to enter BIOS set-up"
Press the appropriate key fast as you only have about 5-10 seconds to do it, otherwise you must reboot to catch it again.
Before changing any settings, write down current settings in the various categories. There are walk thru instructions so don't be intimidated. When you have located and changed settings, you must then choose "Save settings to CMOS (or BIOS) and exit".
Its a snap
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"Quis custodiet ipsos custodes" RKBA!