cant create anything 'new'

hi, recently I have been getting this problem where I can't create anything new on my desktop. every time I right-click on my desktop I can't do everything apart from creating anything new. when I hover my mouse over the tab 'new' my screen refreshed and sometimes even crashes. I have tried to remove the tab in registry and add it again but the same problem occurs. I can do everything else on the menu such as view, sort by and refresh but not 'new'