HELP Adobe Digital Editions not opening

Hi,

I'm trying to  use my Adobe DE for my KOBO and when I'm opening the page the only thing I have is a blank page with que upperline and the only button I can use is Help. I tried about 10 times to delete and dowload again. I tried the version 2.0 and 3.0,  the last time of the 3.0 was opening....I succefully download the bookin the ADE before he desapeared. I tried to click to run as admin....

So I can't rent book since 3 weeks. I've also tried to create another adobe ID. I also tried the appli on my cell phone and it's working but I can't tranfer the rents books on my kobo...

WHAT CAN I DO ???

Thank you. Sorry if my english is not verry goog, I speak french!