Cubase 6 ALWAYS crashes when updated. Windows 32 bit.

OS: Windows 7
CPU: i7
Ram: 4GB
Sound Card: ESI ESU1808

I am using Cubase 6 on my 32 bit windows 7 home premium desktop.

whenever I install a maintenance update for cubase i.e. 6.0.3 or whatever and then open a project from perhaps 6.0.1 or any previous version I get the runtime error.

Please help