Problem in opening PDF file.

I wanted to open a PDF file but the system could not find the program to open it. I tried installing Adobe Reader X but received error message:
This product is already installed.
Error Code : 12010.
I then uninstalled the program from system and tried reinstalled the Adobe Reader X that I downloaded from Adobe Website, but I received error message:
Windows Installer does not permit patching of managed advertised products. At least one feature of the product must be installed before applying the patch.
Any solution on this?
