Having the same problem here. Did anyone find a solution?
found this solution trying it now...
I struggled with the black login screen on two different computers; my desktop pc with nvidia and amd, and now my laptop which is Intel i5 with on board graphics. Reinstalled, ran the integrity, deleted the air client folders, you name it, nothing helped. Found out the actual cause on both PC's was due to the registry/my documents folders. Here's the fix:
Open Notepad (wordpad, etc.)
Copy and Paste the following:
md C:\Documents
reg add "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders" /v Personal /t reg_sz /d C:\Documents /f
reg add "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders" /v "My Documents" /t reg_sz /d C:\Documents /f
attrib +r -s -h "%USERPROFILE%\Documents" /S /D
Save the file as a windows batch file (.bat)
Run the file
Restart computer
VIOLA!!! Hope this helps!!!
(Windows 7 64 bit on both my machines, FYI. One professional, one home)