Photoshop: Can't install Photoshop CS (8.0) on Windows 7

I have the disc for Photoshop CS. It used to work on my Windows 7. I just got a new computer, and now it won't install. The "End License User Agreement" screen comes on, and the ghost image of "Agree" appears throughout the entire agreeement. There are about 30 "Agree" ghostly buttons as you scroll down. When you click on the "Agree" button, nothing happens. Can anyone help me install my Photoshop CS onto my Windows 7 (as it worked on my last Windows 7). Thanks!