Check in the Add/Remove Programs for the existence of two Ontrack SystemSuite 4.0 entries. If two are found, remove both of them. Then reboot and delete the install folder (by default C:\Program Files\[Ontrack or vcom]\SystemSuite) before reinstalling the full version. If only one Ontrack SystemSuite 4.0 entry exists in Add/Remove, then remove the one then reboot and reinstall. 

If after reinstalling there are still two icons in the SysTray, check for the presence of multiple "mxtask" entries in the Task Manager. You can bring up the Task Manager by pressing Ctrl, Alt, and Delete simultaneously. In XP, mxtask.exe should only appear twice under the Processes tab.