To increase the amount of memory Windows will save for locked I/O operations, open the Registry and look for this string:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SessionManager\
MemoryManagement
Right-click on the 'IoPageLockLimit' string in the right pane and enter one of the values below in the Value box:
4096 For 32 Megabytes of memory or less 8192 For 32 to 64 Megabytes of memory 16384 For 64 to 128 Megabytes of memory 32768 For 128 to 256 Megabytes of Memory 65536 For 256 or more Megabytes of memory