Windows Not recognizing Uno

Guys,

Please help me! I'm trying to connect my arduino Uno to my laptop but with no succes. just like most of you've said in this topic, when i connect arduino to latop USB the Windows (win 7 pro) doesn't recognize but the problem is that when i try to do by clicking on device manager\properties\update driver\search in the computer\allow to choose on a list...\with disk\ "go to the folder" and select , it says that there is no file to work with win 64bits and moreover, it is set up by windows as a "unknown device of USB type" so if try look for a driver on windows list (i saw in a post on the internet that would work if a choose comunication driver) i only shows up USB drivers :(.

What else can i do? is that a hardware problem? I'm new at arduino's stuff and need to get it to work in order to finish my school project .... please help me!!!!!