Hi i have the same thing happening .but it does it all the time . some times if i boot up it freeze or if i leave it alone for a while .again no responds to keyboard or mouse the only thing you can do is a reboot.
Now ,i have been told in a topic that i should install using the cd method cause i install from the quick dvd vr beta3 & 4 ,i also install the quick dvd RC1 to see would it get rid of the problem but it didn't.
i'm in the middle of recording my screen so i can post it here for support to look at ,
again i'll post here any success on the matter. i will be using the cds for installing
P.S its nothing to do with ripping the cds.