Another thought - do you have a virus checker running that could be interfering with the install from this media? If so, try disabling it, then retry the install.

To rule out other problems, you should really close all running applications before installing any software.

Can you try a different CD/disk to see if there is a problem with access to the drive - or perhaps the media has become damaged.

Hope you get it resolved.
Regards

Softrak Support