SDL Trados 2011 code activation wizard doesn't run

SDL Trados professional (single user)  and MultiTerm 2011 on Windows 7 32 bits

The code activation wizard doesn't run long enough to enter the licence code, the window doesn't appear completely, and some part are blank.  I have already tried two methods I found here.

Is there anything that can be done to start the software ?

Thank you in advance