Hi, I am Ryan and I can help you with this.
So he locked the main user account?
The account is password protected?
so what happens when you try to login to the locked account?
ahh ok, well then this is a different issue. Locking the computer leaves you logged in but just goes out to the login screen and won't let you access the computer again until you login again. So if its reaching the desktop but not doing anything, this is a different issue.
So, it sounds like you can get into the start menu?
ok, is everything in the start menu working?
ok, so the issue is solely with the icons on the desktop?
everything else is working properly?
ok, so when you try to open something from the desktop, what exactly happens? nothing at all?
does the icon get highlighted?
i see, and what is it that you are trying to open? is it a shortcut for a program? or is it a file of some sort?
ok, do other icons on the desktop work?
what is another one that doesn't work?
and they all behave the same way? you click them, the circle goes, but nothing happens?
ok, what happens when you try to open skype from the start menu?
ok, what web browser do you use? Internet Explorer?
so click on Start, type: taskmgr and hit enter
on the processes tab, look through the list for firefox.exe
ok, right click on each and select end task
or end process actually
once you have done that, try opening firefox again. Just once, don't keep trying to open it.