The subject behavior can be caused by the ClickSaver feature of IntelliPoint AND the single-click feature of Active Desktop.
To fix the problem, either disable ClickSaver or Single-click to open an item (point to select).
To disable ClickSaver:
1. Control Panel / Mouse / StepSavers.
2. Clear the ClickSaver check box.
3. Press OK.
To disable Single-click to open an item (point to select):
1. Start / Settings / Active Desktop / Customize My Desktop / Folder Options / Yes / General tab.
2. Click Custom, based on settings you choose and press Settings.
3. Press Double-click to open an item (single-click to select).
4. Click OK until the dialogue boxes are closed.