Okay. So to check the memory, do I just remove the two sticks one at a time and try to install Windows?
There are software tools to check whether there are memory problems. There is Windows Memory Diagnostic on the Win 7 DVD (under the "Repair My Computer" menu).
Or you could download something like Ultimate Boot CD which contains Memtest86+ (a well established RAM testing program) and other utilities which might turn out to be useful later, like HDD diagnostic tools. Whatever you use, it will take a good few hours to complete a thorough memory check. If you don't have alternative CD burning software installed, use IMGBurn to write the ISO to a CD. Don't simply copy the ISO file to a CD as that won't work.
Edited by jonuk76, 05 February 2014 - 11:01 AM.