What VIRUSES may do?

WHAT VIRUSES MAY DO TO YOUR COMPUTER

What can virus do to your computer once it has been infected? Below are possibilities you may experience when you are infected with a virus. Remember that you also may be experiencing any of the below issues and not have 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.

• Different types of error messages.

source : http://www.computerhope.com

Add to :