Hey,
If you play the DEMO version then the full version should be about the same or possibly slightly better due to post-demo patches.
Don't run any other programs like a web browser when gaming to avoid eating up resources.
So what your hardware is doesn't matter for this game, though for future reference you can use SPECCY to make things easier:
https://www.piriform.com/speccy
Important info:
1) Windows version (including if 32 or 64-bit).
2) CPU
3) GPU
4) System memory
*Note if you only have 32-bit Windows your available system memory is roughly 4GB-0.2GB-(VRAM). So if you have a 1GB video card you can only access up to roughly 2.8GB of system memory even if you have more installed.
**For the next TWO DAYS you can upgrade W7...