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Basicly Microsoft is aware of a right click problem where 100% of system resources are used. Here is their work around:
WORKAROUND
To work around this behavior, use either of the following methods:
Method 1
Turn off the transition effects for menus and ToolTips. To do this, follow these steps:
Click Start, and then click Control Panel.
In Control Panel, double-click Display.
In the Display Properties dialog box, click the Appearance tab.
On the Appearance tab, click Effects.
In the Effects dialog box, click to clear the Use the following transition effect for menus and tooltips check box, and then click OK two times.
Method 2
Click the folder or file that you want (select it) before you right-click it to display the shortcut menu.