From adobe support forums....
Have a look at this KB article and see if it helps.
Please note you MUST have your system set to show hidden and system files and folders when looking for the acr*.tmp files or you wont be able to see them.
http://www.adobe.com/support/techdocs/31e12.htm
Basically it says to find and remove all (including hidden/system) files labelled acr*.tmp.
Also, try to log into your machine as another user and see if that works. The tmp files are user specific.
Have a look at this KB article and see if it helps.
Please note you MUST have your system set to show hidden and system files and folders when looking for the acr*.tmp files or you wont be able to see them.
http://www.adobe.com/support/techdocs/31e12.htm
Basically it says to find and remove all (including hidden/system) files labelled acr*.tmp.
Also, try to log into your machine as another user and see if that works. The tmp files are user specific.