Not enough memory or resources. Exit some programs and try again — You have too many programs open. Close all windows and open the program thatyou want to use.Operating system not found — Reinstall the hard drive (see Hard Drive). If the problem persists, contact Dell. See Contacting Dell.Optional ROM bad checksum — The optional ROM apparently failed. Contact Dell. See Contacting Dell.A required .DLL file was not found — The program that you are trying to open is missing an essential file. Remove and then reinstall the program.1. Click the Start button and click Control Panel.2. Click Add or Remove Programs.3. Select the program you want to remove.4. Click Remove or Change/Remove and follow the prompts on the screen.5. See the program documentation for installation instructions.Sector not found — The operating system cannot locate a sector on the hard drive. You may have a defective sector or corrupted FAT on the hard drive. Runthe Windows error-checking utility to check the file structure on the hard drive. See the Windows Help and Support Center for instructions. To access the Helpand Support Center, see Windows Help and Support Center. If a large number of sectors are defective, back up the data (if possible), and then reformat thehard drive.Seek error — The operating system cannot find a specific track on the hard drive.Shutdown failure — A chip on the system board may be malfunctioning. Run the System Set tests in the Dell Diagnostics (see Dell Diagnostics).Time-of-day clock lost power — System configuration settings are corrupted. Connect your computer to an electrical outlet to charge the battery. If theproblem persists, try to restore the data by entering the system setup program. Then immediately exit the program. See System Setup Program. If themessage reappears, contact Dell. See Contacting Dell.Time-of-day clock stopped — The reserve battery that supports the system configuration settings may require replacing. Contact Dell. See Contacting Dell.Time-of-day not set-please run the System Setup program — The time or date stored in the system setup program does not match the system clock. Correctthe settings for the Date and Time options. See System Setup Program.Timer chip counter 2 failed — A chip on the system board may be malfunctioning. Run the System Set tests in the Dell Diagnostics. See Dell Diagnostics.Unexpected interrupt in protected mode — The keyboard controller may be malfunctioning, or a memory module may be loose. Run the System Memory testsand the Keyboard Controller test in the Dell Diagnostics. See Dell Diagnostics.x:\ is not accessible. The device is not ready — Insert a disk into the drive and try again.Warning: Battery is critically low — The battery is running out of charge. Replace the battery, or connect the computer to an electrical outlet. Otherwise,activate hibernate mode or shut down the computer.ExpressCard ProblemsCAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.