The latest iTunes is compatible with Windows 7.
Apple - iTunes - Download iTunes Now
Important Note: Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.
If the issue still occurs, please let us know if you can install other programs with Windows Installer. You can try to install Windows Live Messenger as a test.
Download details Windows Live Messenger
Arthur Xie - MSFT
