Dreamweaver Installation Error DF044

Hello everybody

Everytime I try to install the Dreamweaver using the Adobe Application Manager I get the following error:

Exit Code: 7

Please see specific errors below for troubleshooting. For example,  ERROR: DF044 ...

-------------------------------------- Summary --------------------------------------

- 0 fatal error(s), 1 error(s)

----------- Payload: Adobe Dreamweaver CS6 12.0.0.0 {A4ED5E53-7AA0-11E1-BF04-B2D4D4A5360E} -----------

ERROR: DF044: Failed in SetNamedSecurityInfo(Seq 39)

---------------------------------------------------------------------- ---------------

I've allready tried to start the Adobe Application Manager as an administrator but the same error occurs again.

Can anybody help me with this?

Thanks in advance.

Tobias