Haw to delete old windows when have a new one

Ok, backup all of your personal files e.g. documents, movies, pictures, music, bookmarks etc to external storage. Put your window 7 dvd into the optical drive. It should boot using the dvd and simply follow the installation instruction. If you cannot boot from optical drive, go to bios and enable it as well as setting it to priority one.

My advice in moving the PC to a new OS, is to buy a new hard-drive and install it on that one. That way you can be sure no files were missed during a backup.

Also make sure the computer had Win 7 support for drivers.