All Techical suite X& apps do not start

HI all,

I am having a stiff problem with Technical Suite X6: all main applications (Corel Draw, PhotoPaint and Designer) refuse to start: when launching, the splash screen is shown for some seconds, then goes out and nothing more happens. Inspecting with Task Manager shows that the programs exit after a few seconds. This happens under win 7 pro sp1 x64. I tried several ways:

There is no error mensaje whatsoever, nor nothing recorded in windows events.

Pressing F8 at program launch has no effect.

Uninstalling and installing again did not cure the problem, even running ccleaner and rebooting before reinstall

Windows 7 is up to date, latest updates installed.

Attempted to disable the antivirus, but no succes either.

I found in the forums that .net version 4 is required to work, thus I downloaded a reapir tool from MS (http://www.microsoft.com/en-us/download/details.aspx?id=30135), proceede through several steps, but no luck.

I have the same version of CDR technical Suite installed at home working OK, but in my main machine at work it did not works.

Please help!

Thanks