If you have a Windows XP operating system CD, you can go to START>RUN and type in sfc /scannow. SFC stands for System File Checker, and will scan your Windows XP installation for corrupt or damaged files. If it finds any file issues it uses the CD to fix them. It's best to have all other applications closed when scanning.
System File Checker. wish you got good grade, cos now I'm doing this exam in cisco too
You can copy the new command.com file to C:\ & C:\Windows\Command & C:\Windows\System
Ya Linux is virus free OS, How?? Answer: Linux OS Extracted files and folders are kept hidden which cannot be accessed by viruses. Now what are Viruses?? Viruses are the files which carry the path-name of the WINDOWS FOLDER present in Windows OS where all the functional .(DOT)dll files are stored. Once these .dll files get corrupted then the PC starts behaving like a mad bull. So, these .dll kind (not the same format files) of files are also their in Linux OS but they are kept hidden, as a result the virus path cannot find them. Thus, no damage but still the files stored by the user on a Linux machine get corrupted.
Replace the corrupted command.com with the command.com from your OS system disk.
All the files under C:\Windows, which is what contains the OS.
C:\windows
rar recover corrupted archives of RAR format, when it is not possible to redownload these files or other copies are absent. Tool opens/scans/repairs corrupted archives from any place, it can be hard disks, removable media or network places, zip drives, flash cards. Software works under all popular Windows OS, starting with Windows 98.
In the Windows OS it is Windows Explorer.
You can directly update your Windows 8 through internet. You must have the admin rights.
Windows XP is a long time operating system from Microsoft. The bootable files in that OS are command.com, autoexec.bat, win.ini, win.ini, and ntdetect.exe. There files are needed for proper booting of the OS.
Re installing the Windows OS without formatting the disk will keep your files safe. Only the system files will be rewirtten no change will be to the data files. But files stored in My Documents and Desktop will be lost if you are going for a clean installation. Download Recover My Files software to recover your old files after a system crash.
Structured files contain records, unstructured files are byte-streams. (Modern OS's (Windows, UNIX) have only unstructured files.)