To install, locate the current ibmlb.sys on your system. This file is typically located in %SYSTEM32%\drivers directory. If you are unsure of the location of the file, you can issue : dir /s ibmlb.sys from C: (or D:) to locate the file. Stop the load balancer : dscontrol executor stop dsserver stop Rename your current ibmlb.sys to ibmlb.sys.old and copy over appropriate new ibmlb.sys Remove the .32 or .64 extension; this extension indicates the bit size of the executable and should match the architecture of the system. If you are unsure of the architecture of the machine, consult the System Properties from the control panel.