Max_x2, NX Bit is the same as Execute Disable Bit. It finds malicious code in RAM, and disable it from running. Windows 8 requires SSE3 (won't be able to explain that one), NX-Bit, and PAE (Physical Address Extension, allows up to 4 GB of memory on 32-Bit). Aside from that, all 64-Bit/x64 Operating Systems require the AMD64/EMT64 (64-Bit instruction).
To correct my statement from above, your computer CAN run 6.3.9600.16385 (Windows 8.1 RTM). It has the 3 instruction from above. However, you can't run 64-Bit as your processor does not have the 64-bit instruction.
And you might like to invest in a notebook graphics card part.