Being run this trojan shows a messagebox 'This is user-friendly Windows 98' and starts to randomly move mouse pointer. It also blocks keyboard so you can't kill the trojan task in Task Manager and continue working with other applications. The computer has to be reset - all unsaved data in opened applications will be lost.
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.