Do you get any error message? You click on restart now and then what happens?
You should find 2 log files, setuperr.log and setupact.log probably in the hidden directory C:\$WINDOWS.~BT\Sources\Panther but you may want to search the whole disk as they may be in C:\Windows or C:\Windows\Panther
These will tell you what is causing the problem. Look at setuperr.log first - if it is not empty and says something like this
then please let us know.
2016-01-08 15:29:52, Error CONX 0x80004005 put_value failed for ProductVersion
If you like you can upload the whole files and someone will have a look. Please edit them before uploading (especially the SetUpAct.log) as they will contain your email address (if you use a MS account) and IP address which you probably want to keep private.