Help! Acrobat Reader DC has completely stopped working

I'm running Windows 7 64 bit, and Acrobat Reader DC recently stopped working completely. If I try opening PDF documents or if I try running the program, I momentarily get a rotating busy indicator, which seems to suggest something is happening, but the program never actually opens, and it doesn't appear in task manager either (all I see are armsvc.exe*32 - Adobe Acrobat Update Service under processes and AdobeARMservice under services). I've tried every possible solution I could think of or that I found online, but nothing seems to have worked!

Including:

• I've tried numerous times to uninstall and reinstall Acrobat Reader, both through Add / Remove Programs and by using the Adobe Reader and Acrobat Cleaner Tool (which I saw referenced here: Reader DC completes installation but can't open application or a pdf)
• I went through the steps I found here: Resolve the issues when uninstalling Adobe Reader 8.0 to completely remove all references to Reader in my computer's registry before reinstalling
• I went to Add / Remove Programs in Control Panel and clicked where it said "repair installation errors" for Acrobat Reader
• I temporarily disabled all antivirus and anti-malware programs to make sure nothing else was somehow preventing Reader from opening
• I went to msconfig and restarted my computer using selective startup to ensure no other programs were interfering with Reader
• I ran 5 different anti-virus and anti-malware programs, as well as the Windows Malicious Software Removal Tool to make sure I didn't have any viruses or anything else that might be preventing Reader from operating properly
• I even spent several hours on the phone with two different computer repair support people who remotely connected to my computer, but they couldn't figure it out either!

This is incredibly frustrating, cause Reader used to work fine, and now it suddenly stopped for no discernible reason. Does anyone have any other ideas of how I can fix this??