Installation & Licensing

[#1]

Hi, I am spanish, so I'll try to explain as best I can.
I use win 7

First I install 3DS Max, (trial version) it works perfectly.
Then I unistall VRAY using Revo Unistaller Pro, but this program eliminated several files in the folder of 3DS max, and it stops working, so i unistall completely 3ds max  and reinstall, but when i try reinstall, the installer says to me that 3DS max is already installed.
After that, i try to unistall all autodesk software in my computer, (autocad, librarys... etc) and reinstall them, all  work perfectly, except 3DS max, when i try to reinstall, the installer says me that 3DS max is already installed.

Can you help me?, how can i  fix that problem?

[#2]

To Diagnose and Fix installation problems automatically, please see the new Microsoft tool for this here:

http://support.microsoft.com/mats/Program_Install_and_Uninstall

For more information on the Autodesk KB Support article concerning the clean uninstall of Autodesk products, see this link:

http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=2887771&linkID=9240617

For all other installation problems consider using the Microsoft Installer Clean Up Utility. For more information on this program, please my forum post here:

http://forums.autodesk.com/t5/Installation-Licensing/Microsoft-Installer-Clean-Up-Utility-for-Add-Re...