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Unable to open WorkSpace using CCS-5.5 on 64-bit Windows 7

Hello,

 I had no problem at all in opening workspace using CCS up to 5.4 on Windows XP for years.

Now I have to upgrade to 64-bit Windows 7 due to IT policy at work.

I also install CCS-5.5, just because I don't want to take risk using CCS-6.

I was able to open a new work-space right after installation.

Now I'm NOT able to open that work-space, even worse, I'm NOT able to create any work-space, no matter where it is, even after reboot PC

What should I do ?