11.7 Plus Hardcard . To run Windows version 3.1 with a Hardcard, you must include the following line in the [386Enh] section in the SYSTEM.INI file: VirtualHDIRQ=Off For information on how to modify the SYSTEM.INI file, see the SYSINI.WRI online document. Note: This procedure is not necessary if you are using a Hardcard II or a Hardcard II XL. . It is also recommended that you use SMARTDrive with a Hardcard. For more information about using SMARTDrive, see Chapter 14, "Optimizing Windows," in the Microsoft Windows User's Guide. .