Context menu is slow to display

We have a user who, no matter what method she uses to see a list of files (i.e. Explorer, My Computer, File Open dialog box, etc), if she right-clicks on a file to see the context menu, there is a delay of about 30 seconds before the menu comes up.This is regardless of how much is running and the machine has 128 MB of RAM, so I know it’s not the memory. Any suggestions?