Windows 7 Lightroom 4.3 64-bit install

I download and install the program and can successfully go into the Library.  But when going into the Develop Module I receive an error message that says,

Adobe Photoshop Lightroom 64-Bit has stopped working. 

When downloading from Adobe I first make sure my anti-virius is disabled.

Before installing I go to the Control Panel and make sure LR is not present.  Also verify the Programs Folders as well.

Then I proceed with download.  What else I do not understand with the fresh download, previous changes made to LR are still present although the program is removed from my system before beginning download as previously stated. 

Can you please provide a solution.

Thank you,

Louise