First use a product such as from Nirsoft to save both the BIOS key (which should be for 8.1) and the current key (for Windows 10. That way you have records of the product keys if you need them.
That said drivers for devices are continually being rolled out but what you describe sounds like a conflict, perhaps in IRQs (can check with MSINFO32 submenus).
Depending on what you are trying to do, 4gb and an i5 should be able to do almosta anything including Windows 64, I rarely go over 2gb on my machines (sitting on 1.9gb right now: Windows 10-64 Anniversary).
Now have all machines (except one ea XP desktop & laptop) running Anniversary including three tabs with 2GB ram & 32GB SSDs. Those were fun. Auchient Aspire 1 532h was a breeze in contrast but had been hotrodded a bit.
Point is I suspect that you have conflicting drivers and while non-trivial to correct, it is usually a matter of installation order which requires diddling the registry.
Do not have an S7 to test but have one of my development machines set for dual boot, Win 7 and Win 10. Can be very handy to resolve conflicts and just requires multiple partitions.
I agree about the 11.6" form factor, part of the reason I bought an R3, it is nice.
