Tell you what...I obviously couldn't help BUT wondering if THIS bit of info you gave us could have anything to do with this...
I'm using a clean install of Media edition.
Is this what was originally on the machine to begin with? If not then what was there? If it Media editions WAS originally on the machine then why did you feel the need to do a clean install?...AND...exactly how did you install? Are you certain you have all correct hardware drivers, etc.? If they are the originals have you updated EVERYTHING since your clean install?