files, documents and entourage id have all disappeared from desktop and documents fol

Hi,

about a week ago all of a sudden all the files and documents from the desktop and documents folder all disappeared. The user identity in entourage has also disappeared. if I search on spotlight for anything that contains the entourage user id the emails show there but if I double click on them, entourage opens with a message "to view the item, switch to the xxx identity" but if I try to do that, that identity does not show as an option. I have been unable to find any word documents that were previously there by searching using spotlight. I have tried searching on the internet for a solution to this problem but can not find anything that solves the issue. Please help as many irretrievable and important items (including email) are much needed! This is my sons macbookpro that runs 10.7.2 and he uses it for his schoolwork utilising assistive technology so ALL his saved schoolwork is gone.

thank you but there is no other account to log into, what is so perplexing is that if i go to spotlight and search for anything using his email id then we get all his email messages appear in the subsequent list, however if you double click on any of those entourage opens and shows the message "entourage cannot open this item. to view the item, switch to the xxx identity" but his identity is not available in the program to switch to". If i go to the bottom of the spotlight screen. it says where it is, but if you actually go there, it doesnt show. We are both totally perplexed. It has nothing to do with the assistive technology - all his software is on the one account - the only account on the laptop.