That's the driver for the DMB32. To hide it from SYSGEN it just needs to be renamed: $ RENAME SYS$COMMON:[SYS$LDR]SIDRIVER.EXE SYS$COMMON:[SYS$LDR]SIDRIVER.OLD But just in case, it might be worth checking that you don't have more than one version lying around: $ DIR SYS$LOADABLE_IMAGES:SIDRIVER.EXE Normally I would suggest purging down if multiple files are kicking around, but since this system is all you have, I'd go with renaming all of them and keeping the version numbers the same i.e. $ RENAME SYS$COMMON:[SYS$LDR]SIDRIVER.EXE;33 SYS$COMMON:[SYS$LDR]SIDRIVER.OLD;33 or whatever. The other WAN device drivers you won't care about are SJDRIVER, SLDRIVER, SFDRIVER, SEDRIVER, ZTDRIVER and ZWDRIVER ... actually I'm sure there are more, I've just mislaid my list! If SIDRIVER is out of date I guess that the rest will be too. However, I assume that SIDRIVER is getting dragged in because SYSGEN found a DMB32? Antonio