Thanks Rudolph. I'll probably leave the SPLIT8MB file on the system and just REM out the line in autoexec.bat rather than remove it. Then I can easily re-enable it if any problems do appear. You do say that new programs can sometimes over-write your patched files and cause problems to come back, and that will be "belt and braces" should that ever happen! Cheers, Dave. Fortunately, unlike my High Capacity Disk Patch, if the Patch is overwritten, your Computer will not boot but no damage will occur. You can reinstall the Patch from DOS. In an earlier post, you mentioned getting a blank screen when your Registry was within a certain range. I observed similar behavior. There is a narrow range where VFAT initializes properly but the boot does not complete. On occasion I have seen crashes on the VXDs that follow such as VPICD. This has been reported by others in other forums. I suspect that VFAT crashes are the most common symptom because it probably is the first to reserve DMA buffers.