I want to reinsall the OS from the recovery partition on my Vaio Duo 13 as it's running Windows 8.1 now. but the recovery process both within Windows and from the BIOS menu claims that the installation files are missing and asks me to insert a disk. I tried inserting a Windows 8 installation USB but nothing happened.

How do I go about reinstalling it now?

Also, has Sony gotten anywhere with the Connected standby + Hyper V issue?

(posted it again because this is a hybrid - both PC + Tablet)