@eva2000:

Create a 4GB file ( WinRAR, UltraISO, anything ).
Don't use maxmem.
Open up SuperPi set the calculation, and leave it at the "Now start to calculate..." window ( waiting for you to press ok )
Copy the wazza file from D:\ to C:\ and then from C:\ to D:\Temp
As soon as the last copy process finishes click OK to start the calculation.