Problems installing - it complains of insufficent RAM and disk

I have problems installing v18.

It complains about RAM and disk. The disk is 256gb.

RAM is 4GB (exactly). (BIOS shows it as 3,3 GB but physically it is 4GB)


Is there some way of bypassing the error? Since I know I do meet the requirements. (2x 2G sticks = 4GB)