ADE 4.5.11 stopped for no reasons at all ..Guys I need you help!!!!

Had ADE 4.5.11 installed for many months without a problem. suddenly this morning it would not open no matter whe I did,  Reloade several time but it still would not open.  Have a book pending throug local library and Overdrive and it will not go past the security check.  What can i do?  any help more than welcome as I am at my wits end