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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