Yes I've had the same thing with the same operating system.
It appears to hang loading mup.sys (or something lke that, forgive me this is just from memory and I'm downwind of a few glasses of Merlot).
Go make a cup of tea and come back, be patient and it finally happens.
Lord only knows why it takes so long, but it does.
Any pointers from others 'in the know' gratefully received.
Let us know how you do.