Free fix for you
Something in your Context Menu is locking you up when it tries to display. Download and run ShellExView. Sort the list by Type and look at the items listed as Context Menu. Disable anything related to a recent install. One of the items in the list is screwing you up. Trial and error will narrow it down. At first, assume Windows and Microsoft items are not the problem. In my case, HP Instant Printing was locking me up.