DW CS6 extension manager hangs up when installing an extension

I downloaded Ajatix Pure CSS Menus and clicked the message "Install in Adobe Extension Manager"  and the Adobe Exchcange window popped up.  Progress bar appeared with the message "loading extensions"  The whole things gets hung up and the only way to stop it is to call up the task manager and cancel the program.  If I call up the Exchange Manager through DW, the same thing happens automatically.  Prior to downloading this extension, I could open the extension manager with no automatic action.

I have a Toshiba Satellite laptop with Windows 7 Professional, 8G memory, Intel core 13 processor.

I can't find the file location for the extension to delete it.

How do I restore things to normal.  BTW, this is a fairly new install of CS6 (installed about a month ago)