Open Registry by going to START-RUN and typing REGEDIT. Navigate to [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\IoPageLockLimit. Depending upon how much RAM you have, you can increase your diskcache size by entering a higher value in IoPageLockLimit. Typically your computer won't come optimized for diskcache and you can set to a value which works best for you by trial and error.Rule of thumb is to have a ratio of 1 or 2 for every 64K chuck. But try out various different values as each case would be a little different.