A couple of steps are needed to be looked at here to ensure your computer will boot from recovery media before Windows is called to boot.
- When your computer is first starting, enter the BIOS (Basic Input/Output System) via hitting the F2 or similar key repeatedly tapping it to access the BIOS setting screen. This would normally be when the computer manufacturer's screen first displays just before Windows begins to boot. If the correct key is pressed and you see the settings page, then you are inside the BIOS.
- Navigate to the settings tab where the boot order is set: Default settings are normally hard drive first, floppy second, CD-ROM third.
- Change the boot order to: CD-ROM, floppy, hard drive. Press F10 or similar to save the new settings.
Your computer manufacturer will have the correct F keys listed to enter the BIOS on your system. Go to the website to find that information, or look at the vendor of the BIOS itself to find this. There will be a listing of the proper F keys to use within the BIOS itself, so look for that when in there. Phoenix and American Megatrends are two of the most popular BIOS vendors. http://pcsupport.about.com/od/fixtheproblem/a/biosaccess_bios.htm
All computers use BIOS to set operating parameters and conduct a self-test, POST
(Power On Self-Test), to ensure all hardware is operational and working properly before Windows starts. So, there always are two operating systems on a computer, the BIOS, and then the OS of choice (in this case, Windows). BIOS starts the computer for you, and makes it ready for the operating system to load.
Once you have checked the boot order, and set to the correct order if needed, then
you can move on to the next step.
An .iso file cannot be used as is. That is to say, merely copying the .iso file to a CD will not work. It must be opened and expanded by a third party application to decompress it and make the CD bootable. See attached below for an iso file that has been properly opened and the CD made bootable. If, when you look at the CD you made, and you do not see the folders and files within, then a copy of the .iso file has been made, and the CD cannot boot. A proper burn of the .iso file was not done.
I believe Win7 can natively burn the .iso file to disk, and thus make it bootable. If not, then go here: http://www.imgburn.com/
Download this free application and burn the .iso file to CD disk. View the contents in Explorer when done, if folders/files are present, you are good to go.
Now you should be able to conduct a test of your memory. Please post back what the results were. Use only the basic default settings to scan.