Error on Installing CS5.1, CS6 - Exit Code 15, ERROR: Media DB Error 6

Question

Hi. I am trying to install Photoshop CS6 trial on my machine (win 8 x64) but all the time it returns the error:
Exit code : 15
Summary
- 0 fatal error(s), 1 error(s), 0 warning(s)
ERROR: Media DB Error : 6
I have already used all the steps described on the forum (restarting the PC, downloading again the app, using Adobe Clean Tool) and no success. I even tried to install Photoshop CS5.1, but it goes with the very same error.
I currently have Fireworks CS6 installed, which I managed to install several months ago without a problem. However, when I try to uninstall it, it shows me also an error message:
UNINSTALL FAILED
Your uninstallation encountered errors.
Troubleshooting tips:
1. Restart your computer.
2. Exit all applications [...]
3. Uninstall again.
You may also download & run the Cleaner Tool. If the problems persist, please contact Customer Support for further assistance.
Well... here I am, Customer Support!
I can't seem to make this thing work. I've passed my whole weekend reading about it on the web and no solution found whatsoever. How can I sort it out, please?
Thank you,

Answer 1

After using the Adobe Clean tool, I checked its output log and it mentioned it couldn't find a "caps.db" in the Common Files/Adobe/caps/ folder under Program Files or Program Files (x86).
So what I did: I manually deleted the Adobe folders from:
- Program Files
- Program Files (x86)
- Program Files (x86)/Common Files
After that, I was able to install successfully Photoshop CS5.1 and at this very moment I'm able to install PS CS6 (it's been already 50% of the installing progress).
So far, this action of deleting the Adobe folders from my Program Files folders seems to be sorting out the matter...