There is an issue with D7 crashing during startup on some systems in recent versions, and currently I cannot isolate the specific issue.
In the mean time, the download (and update) links for D7 have been reverted to v8.5.50 which is known stable. If you are experiencing any issues with a higher version, please downgrade to v8.5.50 if possible by simply forcing a D7 update – if you cannot start D7 then download the full package here, and extract the D7.exe to your D7 directory – the rest of the files don’t need to be downgraded.
Alternately, I would appreciate it if you could try the v8.7.9 Pre-Release version available here, (extract the D7.exe to your D7 directory, don’t worry about the rest of the files) and post on my forums if this has resolved the issue or not.
I apologize for any inconvenience, and I will work diligently to resolve the issue ASAP.
UPDATE: Several early reports are in that the bug is fixed in the v8.7.8/v8.7.9PR versions, but I’m leaving v8.5.50 up until I can confirm this to be resolved from more techs, as one person informed me the update did not resolve their issue.