As an A+ Certified Professional you will troubleshoot a number of different problems on the system — this information outlines some of the popular utilities you will use to support or troubleshoot a system. Be sure to know these before taking the A+ Exam!

Filename Name Description
chkdsk.exe Check Disk Check your hard drive for problems with the file system and for bad sectors.
regedit.exe Registry Editor Make changes to Registry values; can be used to make selective backups. Prior to Windows XP, there were two editors: regedit.exe and regedt32.exe.
defrag.exe Disk Defragmenter Used from the command line, or graphically through the Microsoft Management Console (MMC) and dfrg.msc.
sfc.exe System File Checker Verifies that system files have not been modified; or, if they have, replaces them with the original. It works with the hidden C:\windows\system32\dllcache directory and the original operating system CD.
taskmgr.exe Task Manager See running programs and services, terminate problems, and view rudimentary performance information about the system.
perfmon.exe Performance Console View detailed performance information
msconfig.exe System Configuration Tool Reconfigure the boot process for troubleshooting and diagnosing the boot process.
msinfo32.exe System Information View hardware and configuration information for your computer.
tasklist.exe Task List Display a list of running applications or services on a computer.
taskkill.exe Task Kill Terminate a running application or service on a computer.
gpupdate.exe Group Policy Update Re-process Active Directory (AD) Group Policy Objects (GPO) on the computer.
gpresult.exe Group Policy Results Evaluate the resultant policy results and list all GPOs which apply to the current computer or user.
eventvwr.msc Event Viewer Logging component of the operating system; the central location for all logging activity.