3-28 Dell PowerEdge 2100/180 and 2100/200 Systems User’s Guide15. When you see the following message, click OK toexit:The changes you have made will not takeeffect until the computer is restarted.If this message does not appear, no changes havebeen made to the Windows NT systemconfiguration.16. Restart your computer and Windows NT. Somedrive letter assignments may have changed fromthe previous configuration.Removing a Host AdapterRemoving a PCI expansion-card SCSI controller is assimple as physically removing it from its slot when yourcomputer is shut down. Windows NT boots and functionsproperly in this configuration, but a warning message isgenerated every time you boot Windows NT.To eliminate the warning message, you must update theWindows NT software configuration as follows:1. Select and start the Windows NT Setup program.There is a brief pause while Windows NT Setupscans your hardware configuration.2. Select the Options pull-down menu, and thenselect Add/Remove SCSI Adapters. The SCSIAdapter setup program displays a list of all hostadapters currently installed.3. Select the host adapter you want to remove, andclick Remove. When the Windows NT Setup pro-gram asks you for confirmation, click OK.Because SCSI device drivers are loaded during sys-tem start-up and because they may be needed to loadWindows NT itself, a screen may appear warningyou that Windows NT may not start if you removethe SCSI adapter.4. When you are sure you are removing the correcthost adapter type, click OK.5. Return to step 3 if you want to remove driver sup-port for other types of host adapters, or clickClose to exit the SCSI adapters portion of Win-dows NT Setup.6. Close the Windows NT Setup program. When thefollowing message appears, click OK to exit:The changes you have made will not takeeffect until the computer is restarted.If this message does not appear, no changes have beenmade to the Windows NT system configuration.7. Restart your computer.NOTE: The Windows NT Setup program does not deletethe device driver from your hard-disk drive; it onlyupdates Windows NT software configuration informationso that the device driver is no longer loaded during sys-tem start-up.Swapping a Host AdapterThe procedure for swapping one type of host adapter foranother is similar to the procedure for adding a hostadapter, except that you make all software configurationchanges while Windows NT is running, before you makethe hardware changes.1. Install the driver for the new host adapter by fol-lowing the steps in “Installing or Updating theDriver With Windows NT 3.51” found earlier inthis section.It is not essential to remove the device driver for thehost adapter you are replacing. Windows NT dynam-ically detects the absence or presence of host adapterhardware, and no problems should arise if you leavethe existing device driver installed. You can removethe device driver later, after you have successfullyrebooted Windows NT. However, if you leave thedriver in, the system alerts you with an error mes-sage about the extra device driver every time youboot. See “Removing a Host Adapter” found earlierin this section.2. Once the new device driver is installed, shut downWindows NT and replace the existing hostadapter.3. Restart your computer and Windows NT. Somedrive letter assignments may have changed fromthe previous configuration.CAUTION: If you have removed a host adapterbut still have other host adapters of the same typeinstalled in your computer, do not use Windows NTSetup to remove the device driver.