What viruses may do to a computer

Saturday, January 9, 2010

Below are different issues you may experience when you are infected with a virus. Keep in mind that you also may be experiencing any of the below issues by another computer related issue and not a virus.

  • Deleted files.
  • Various messages in files or on programs.
  • Changes volume label.
  • Marks clusters as bad in the FAT.
  • Randomly overwrites sectors on the hard disk.
  • Replaces the MBR with own code.
  • Create more than one partition.
  • Attempts to access the hard disk drive, which can result in error messages such as: Invalid drive specification.
  • Causes cross-linked files.
  • Causes a "sector not found" error.
  • Cause the system to run slow.
  • Logical partitions created, partitions decrease in size.
  • A directory may be displayed as garbage.
  • Directory order may be modified so files, such as COM files, will start at the beginning of the directory.
  • Cause Hardware problems such as keyboard keys not working, printer issues, modem issues etc.
  • Disable ports such as LPT or COM ports.
  • Caused keyboard keys to be remapped.
  • Alter the system time / date.
  • Cause system to hang or freeze randomly.
  • Cause activity on HDD or FDD randomly.
  • Increase file size.
  • Increase or decrease memory size.
  • Randomly change file or memory size.
  • Extended boot times.
  • Increase disk access times.
  • Cause computer to make strange noises, make music, clicking noises or beeps.
  • Display pictures randomly.
  • Different and/or undocumented types of error messages.


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