How to remove Virus from USB Drives

Remove Virus from USB

One of the ways by which a virus can infect your PC is through USB/Pen drives. Common viruses
such as ’Ravmon’ , ‘New Folder.exe’, ‘Orkut is banned’ etc are spreading through USB drives. Most
anti virus programs are unable to detect them and even if they do, in most cases they are unable to
delete the file, only quarantine it. Here are the things which you can do if you want to remove such
viruses from your USB drives.

•  Whenever you plug a USB drive in your system, a window will appear similar to the one shown

•  Don’t click on Ok , just choose ‘Cancel’.

•  Open the Command Prompt by typing ‘cmd‘ in the run box.

•   In the command prompt type the drive letter: and press enter. 

•  Now type dir /w/a and press enter.

•  This will display a list of the files in the pen drive. Check whether the following files are there or not:

                • Autorun.inf
                • Ravmon.exe
                • New Folder.exe
                • svchost.exe
                • Heap41a
                • or any other exe file which may be suspicious.
 

•  If any of the above files are there, then probably the USB drive is infected.

•  In command prompt type attrib -r -a -s -h *.* and press enter.

•  This will remove the Read Only, Archive, System and hidden file attribute from all the files. 
•    Now just delete the files using the command del filename.

KEYBOARD TESTING

KEYBOARD TESTING GUIDELINES

Locate a keyboard; notice the appearance of the keyboard.

  

 KEYBOARD TESTING

1.     There are 2 kinds of keyboards:

o   XT keyboards.

o   AT keyboards.

         XT keyboards are usually 83-key keyboards.

        AT keyboards are usually 101-key keyboards.

        Some keyboards have an XT/AT mode switch on the bottom.

2.     Plug the keyboard into the appropriate test PC and turn on both the monitor and PC.

3.     Use some kind of software to test the keyboard's operation (Checkit, XT or AT diagnostics, etc.)

4.     If the keyboard works properly (that means ALL the keys work), label the keyboard and store it in the appropriate place in the lab.

5.     If the keyboard does not work correctly, test and make sure that the keyboard is attached to the correct PC.

6.     If the keyboard is REALLY DEAD, indicate this on the dead keyboard log and dispose of the keyboard.

7.     If you need assistance, let someone know. If you're unsure of whether a keyboard is OK or not, label the keyboard as such and move on.

HOW DO VIRUSES AFFECT YOUR PC ?

HOW DO VIRUSES AFFECT YOUR PC

Viruses will affect your PC in 4 different ways . . .

•    The Boot Sector
•    The File Allocation Table
•    The Partition Table
•    .COM and .EXE Files


The Boot Sector:

The boot sector is where your operating system files reside on your floppy or hard disk. A virus will go to that location on your disk and corrupt these files (IO.SYS, MSDOS.SYS, and COMMAND.COM) so that your PC will NOT boot up as expected.


The File Allocation Table:

The File Allocation Table (FAT) is a list of all the files on your floppy or hard disk, and where the files are physically located on the disk. A virus will corrupt the FAT so that you cannot locate or access your files.


The Partition Table:

The partition table on your HARD DISK tells MS-DOS how big your hard disk is, and what percentage of it is used by MS-DOS. A virus can corrupt your partition table, which wipes out ALL of your files in an instant.


.COM and .EXE Files:

 Files with these extensions are EXECUTABLE files, which perform a specific action. A virus can attach itself to one of these kinds of files and corrupt the way it operates.