Ontario is a polymorphic, semi-stealth virus. It stays resident in memory and infectes all executed COM and EXE files. COMMAND.COM is infected by inserting the virus code to an unused part of the file.
Ontario will cause vague printer problems.
Two variants, 512 and 1024 bytes in size, are known.
Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.
More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.
You may also refer to the Knowledge Base on the F-Secure Community site for more information.