I have been using 2.1.1 to archive my extensive vintage vinyl lp collection. Today it just won’t load on my laptop. It’s a Lenovo G50 and has been working quit well. The Audacity logo box appears then nothing. I just installed 2.1.1 on my desktop PC and it work fine. I have completely removed and re-installed the laptop and still no go. Both machines have the latest Windows 10 updates installed. 
Are you logging into Windows with the same user account as previously?
Yes, using the same account. However I just found that FireFox won’t load either. Some other programs will load. Don’t think it’s an Audacity issue now. Appears to be a Windows problem. Doing a restore right now as there have been a couple of automatic updates since last used.
OK, restore fixed it. Odd, same updates on the desktop PC and no problems. Must be some hardware, driver issues on the laptop.