I want to delete everything on my computer as I have had it for 4 years and have a lot of junk. I backed up my pics, and info onto cd's. I am Windows 7 and have the cd for it so can I just reinstall it and will it walk me through it?

Simple booting to the OS CD and following the installation instructions will format the drive as part of the process.
Here's the Microsoft instructions: Installing and reinstalling Windows 7 (http://windows.microsoft.com/en-GB/windows7/Installing-and-reinstalling-Windows-7)

If you haven't reinstall Windows before, I would recommend that you find someone who has.

If you haven't reinstall Windows before, I would recommend that you find someone who has.
It reaslly ins't that hard. Once you boot from the CD you are prompted as to the steps to take.

I agree, If you are going to deal a CLEAN REINSTALL of Win 7, its painless and simple.