Windows 8.1 error: Not enough memory to move a file

First of you will lose very much of your available memory with two graphic cards, that's 1GB of RAM lost right there plus the other devices.

There is a switch you can check in msconfig. Go to start, type msconfig and hit enter. Go to the boot tab, click advanced options. Check if the Max Memory option is enabled, if it is then disable it and reboot.

Edit:

The issue is with something called address space. On a 32-bit system you have 4GB of address space and all devices you need to use have to be mapped into the address space. Each device that gets mapped in will carve out a bit of the address space and render it unusable for the rest of the system.

The only way to get more than 2.5-3GB of usable memory in Windows is to install the 64-bit version. After that is installed it will look the same with only 2GB of memory usable. To get all available memory you need to go into BIOS and enable an option called memory remap.

The memory remap features moves all the mapped devices above the 4GB limit in the address space thus freeing up your address space for use by the system.

Running out of commit limit while you still have lots of available RAM is not at all unusual. Neither the commit limit nor the commit charge are directly related to free or available RAM.

The commit limit = current pagefile size + RAM size.

Since you have no page file, the commit limit is smaller than it would be if you had a page file. It doesn't matter how much of the RAM is free. For the commit limit, only the amount of RAM installed matters. You can run out of commit limit even with 90% of your RAM free or available.

Commit charge is a count of virtual memory, not physical. Suppose my program asks for 2 GB committed, but then it only accesses .5 GB of it. The remaining 1.5 GB never gets faulted in, never gets assigned to RAM, so RAM usage does not reflect the 2 GB, only .5 GB.

Still, "system commit" is increased by 2 GB because the system has "committed" that there WILL be a place to hold my 2 GB, should i actually need it all. The fact that on any given run of the program I won't necessarily try to use it all doesn't help. I asked for 2 GB and the successful return from that call tells me that the OS "committed" - i.e. promised - that I can use that much virtual address space. The OS can't make that promise unless there is some place to keep it all.

So: put your pagefile back, add more RAM, or run less stuff at one time. Or some combination of the three. These are your only options for avoiding the "low on memory" and "out of memory" errors.

See also my answers here (longer) and here (much longer).