java code to read data from barcode scanner 15: Maintaining and Troubleshooting Windows in Software

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15: Maintaining and Troubleshooting Windows
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Resource tracking can help solve performance problems The Task Manager and Performance tools help identify bottlenecks To access the Task Manager, press CTRL-SHIFT-ESC, and then click the Performance tab This program tracks CPU usage, available memory, size of disk cache, and other resources or operations such as handles, threads, and processes It also displays the applications and processes that are running and the computer resources they are using If an application hangs, use the Task Manager to end the program It can also be used to switch between applications or to shut down the computer The Task Manager can also shut down locked-up processes The Performance console includes the System Monitor node and the Performance Logs and Alerts node System Monitor gathers real-time data about objects and displays them in a graph, histogram, or report You can add additional counters The Performance Logs and Alerts counters track a variety of system statistics You can determine when the tool will monitor performance and what the log file will be named Preparation is the key to troubleshooting Windows 2000 and XP Five different tools prepare for possible problems: System Restore, the Backup Utility, Emergency Repair Disk, Automated System Recovery, and Recovery Console First introduced with Windows Me, System Restore enables you to create a restore point or configuration at a specific time If the computer crashes or becomes corrupted, you can restore the system settings and programs Data is not lost with System Restore Although the OS itself creates a restore point when you install new software, you can designate other restore points Although many choose third-party backup utilities, Windows 2000 and XP include a full-featured backup program that works with network drives, logical drives, tape, and removable disks Both Windows 2000 and XP offer choices of Backup and Restore With Windows 2000, the third choice is Emergency Repair Disk (ERD); Windows XP offers the Automated System Recovery Wizard The ERD saves critical boot files and partition information Although it is not a bootable disk, it works with the \WINNT\REPAIR folder to store a copy of the Registry Windows XP uses the ASR
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Wizard to create a backup of the system It uses a floppy disk and a backup medium such as tape The restore capability of ASR involves a complete reinstall of the operating system, preferably on a new partition
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Neither the ERD nor the ASR backs up data files You should use the Backup Wizard to back up everything or just system-critical files A third option involves System State data that involves little more than an ERD with a Registry backup The Windows 2000/XP Recovery Console is a text-based startup of Windows To start this utility, run Setup and select Repair If you wish, you can install the Recovery Console on the hard drive as one of the startup options
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The critical system files NTLDR, NTDETECT COM, and BOOTINI must reside in the root directory of the C: drive, and BOOTINI must point to the Windows boot files If any one of these files is missing or damaged, Windows will not start The Recovery Console works as a command-line utility Many of its commands should be familiar to DOS users, but some new commands have also been added Because the file for the Recovery Console is on the system partition in a folder called CMDCONS, this program is useless for system partition crashes, but it is excellent for restoring registries, stopping problem services, or using EXPAND to extract copies of files from the CD-ROM You can also use it to format hard drives and read and write on local FAT or NTFS volumes The four items most likely to show up as problems during the GUI portion of startup are device drivers, the Registry, services, and system files Any one of these can cause a Windows Stop error, more commonly known as the Blue Screen of Death If a driver is the problem, remove the problem driver and install a new version from the device manufacturer s Web site You can restore the Registry by choosing the Last Known Good Configuration boot option or use the ASR to return to a restore point you made You may also boot into Recovery Console, delete the corrupt Registry files, and copy backups from the Repair directory
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