I had some odd issues with my BI pc (kept crashing every 15 mins). I took advice offered here and tried to back out the Intel HD drivers but no luck (went back several versions, clean reboot in between, still crashing), also tried backing off restore points (Win 8.1). Finally I went extreme and exported the BI key (button in gui), saved the .reg file on a NAS share, and did a full OS reinstall. Once the dust settled from all updates, I downloaded a new copy of BI and imported the key. Now when I launch BI I get stopped at the front door with a dialog box wanting a username and password. Unfortunately I cannot figure out what account and password it wants... Any suggestions?