The topic was discussed so many times and without any definite conclusion, except of "not officially supported". Repeated questions show, that interest still remain. I am among those people, who upgraded their PCs to Windows 7 x64 and faced a trouble with existing projects.
Again, as CCS v.3.3 is legacy, starting new project on v5 is good idea. Next I'll describe what I have found so far. (here should be some disclaimer about as is, no promise etc)
First lesson is to install CCS v3.3 in folder other, than Program Files (x86). I have a custom to put TI's software to C:\TI. There will be error during setup process, safe to ignore.
Next is to setup security settings for CCS Setup and CCS itself shortcuts. I came out with the following: tick 'Run as administrator' and Compatibility mode as for XP SP3. Similar settings required for Component manager. The latter one is the trickiest thing. One may wish to use it, when newer version of code generation tools to be installed. I had to discover this process as CCS SR12 comes with CGT 6.0.8, which crash on some complex source file. The problem was fixed in later releases. But trouble is that sometimes Component manager fails to set proper tools. I have no 100% working recipe. Sometimes it helps if advanced settings are opened, but again, it fails more that works. As workaround one may backup c6000/cgtools and install newer CGT there. Also remember, that linker behaviour changed between 6.0x and 6.1.x tools.
Next big issue is emulation. People with USB type emulator are much luckier. I tried with Spectrum Digital XDS510, Black Hawk XDS560. Both vendors provide 64-bit drivers for their emulators and they work fine.
But the true inspiration of this post is my beloved XDS560 of PCI type from TI. Recently I managed it to work too. My recipe. First, install CCS v5.2. Other version might work, or might not, I did not check. Be sure, drivers from v.4 do not work. When installing be sure to tick Install XDS560 PCI option. Operating System should recognize emulator (check device status in Device manager, it is listed in Blackhawk group). If that worked, then its time to run Setup CCS and select XDS560.
Hope it helps, bur remember about disclaimer.
