Welcome to Windows 7 Support Forums.
Susan please fill out your system specs so that we may further assist you.
In the interim, please perform the following procedures as the install was incomplete/corrupted. All ITunes files and executables must be removed!
- applemobile app
- itunes installer
- apple application support
- apple device support
Any other Apple software must be removed!
After that reboot your system.
Download the latest Itunes installer for 64 bit, that would be ver. 9.02 for Windows 7 X64 machines. Put in a location where you can locate it. After downloading put your pointer on the installer and right click your mouse, next you will see a drop down menu and in the middle you will see "Install as Administrator" Left click on that option and let the install begin.
Report back with the results.