need advise after a mistake i made please

hi, running an acer laptop with win7 home premium and definitely clicked the wrong thing last night. well, my intent the other night was to make an invisible file folder visible in my 'named' system folder, ( the one with your name on it and has music/download/document/etc folders in it) but instead I made that 'named' folder disappear, it is still there somewhere 'cause music and videos contained in it still play from links to them I have elsewhere. also since this happened I cannot access the net thru firefox, as I get a 'firefox still running, close previous before opening new' message and this also won't allow me to view Netflix using IE because Silverlight is somehow tied into the mystery firefox app running ( I get the same message as previously mentioned when I try to open/reinstall Silverlight). anyone have a clue as to how I might undo my mistake?, any advise greatly appreciated, thnx

I don't know anything about invisible folders or why that should affect Firefox, but I have seen that "Firefox is still running" message.

I don't know why that message comes up when it appears Firefox is not running, but you can go into Task Manager and kill the Firefox process, and then restart it.

What's the purpose of invisible folders?

I have tried the cntl/alt/del thing, nowhere in taskmanager does it show anything related to firefox or mozella running at all