Hi. In the end the problem seemed to be the ram memory slot, which gives this CMOS error, as it is 1Gb and the Pc sees it as 448 Mb. Changing the slot solved the problem for now, but surely I.ll have to change the memory as well soon. So all good until now.
I.ve managed to get a few other things done, like homing, soft limits, spindle probe script and all went fine.

I.ve watched and read everything I could find about setting the spindle speed via mach3, and still could not solve this yet. The main issue is with PWM Base frequency and Spindle pulleys thing. I either have only 2 speed 24000 and 11000, or I have a few more speeds but the SRO% green line goes backwards, like I have to reduce it to get the spindle to go faster.

The other thing is how exactly do you flaten the work surface. I mean what g code do you use for this?