I can't run SL!

Hello all the people! I have a problem with SL.
When I run SL, its loads all and a white window appers with this message:

Error
Second Life is unable to access a file that it needs.
This can be because you somehow have multiple copies running, or your sistem thinks a file is open. If this message persists, restart your computer and try again. If it continues to persist, you may need to completely uninstall Second Life and reinstall it.


This is the message. I uninstalled and reinstalled the game, and the message persists. I search for another copies running, but I don't have more copies, and a friend sent me his Second Life directory, and still the messages appears.
Can someone please help me somehow??? Can't I play Second Life???
Please answer... Thanks to all

I reckon I know what this is, bLanKaz0! I searched for recent SL Answers that I'd gotten too--and it sounds like what Ameshin Yossarian said. Workaround is in there!

Fear not, this is a known bug... but once you get into SL, you may want to send a bug report from the HELP menu to let us formally know that you too, have been having this problem. I'll also forward your info on.

Apologies for the inconvenience and hope you'll be able to log in!