This worked
Win7 ultimate SP1 x64 and then install patches
• Microsoft Visual C++ 2010 Service Pack 1 Redistributable Package and KB2565063
• Microsoft Visual Studio 2010 -> then Service Pack 1 ( installer) - > and then KB2565057
Then sybase 15.7 sp100
Older windows versions ( xp, win server 2003, win 7 without sp1 ) are not supported they failed.
But I still dont understand why is Visual studio 2010 sp1 and its security update KB2565057 a prerequisite ?
Thanks Mark,