mjslakeridge :
The maximum amount of ram that can be used on Windows 7 32 bit is 4GB. Some of that will be reserved for hardware, so you should have maybe 3.2 GB usable. Remove one of the ram sticks. Refer to your motherboard manual to see what slots to use for dual channel operation.
Not quite.
The "Memory Map" supports a total of 4GB however that also includes the VIDEO MEMORY as well as system memory. If he had a 1GB video card he'd be down to about 2.8GB usable of the system memory. If he had a 2GB video card he'd be down to about 1.8GB usable memory.
Solution:
1. Upgrade to Windows 10 32-bit, then
2. Do a CLEAN INSTALL using a created Windows 10 64-bit Install image
That's the order and it works.
Can get images from here:
http://windows.microsoft.com/en-ca/windows-10/media-creation-tool-install
Obviously you'll lose your data.
Other: You're running in SINGLE CHANNEL mode likely with three sticks... may not make a huge difference to go dual channel depending on what CPU you have though.
If you game and have a reasonably good CPU you might want to get a 2x4GB kit if supported instead.