While Windows does have some built-in support for file compression, it's pretty limited, and definitely not enough even for a slightly more advanced user. You don't have to be doing rocket surgery or ...

The ability to install or reinstall Windows is important when formatting a new hard drive or fixing a corrupt operating system. When the message "Windows cannot open the required file D:\Sources ...

Open the folder in Windows Explorer where you saved the SharePoint Designer 2007 setup file. Click the installation file, and then accept the software license.