Hi Welcome to PCHF--
I have moved your Post to it's own thread so it can get the attention it needs.
http://www.pchelpforum.com/New_User_Posting_Guide.htm
In reading your post -- I have a few questions.
If I understand correctly... you downloaded a BIOS.exe program to his computer and tried to execute it from the desktop ? And you think the system's locked up?
If it is a BIOS upgrade file you can't execute it from the desktop-- Windows does not understand that type of file.
which makes it very UNlikely that you did anything serious.
Try this --click Ctrl/Alt/Delete all at the same time.
this should bring up the task manager window.
at the top it says shut down/click on that/scroll down to log off "user" (whatever name is there)/click on that.
<<NOTE>>
If "user" has a password set to log onto his desktop-- you will need that password to log back on --!
Windows will log off... just log back on.
In most cases this will fix any "hung application"
If the problem is still there:
Follow the same steps to bring up the task manager
this time click "reboot" instead of "log off user"