Delete the following file:
if it says that you already logged in, then delete all the *.lck, *.lock and temp* files.
Or if you are a noob, press WINDOWS key and R then type cmd and copy&paste it and press ENTER
To open the folder press WINDOWS key and R then copy&paste this and press ENTER:
The official Skype for Android not working too. This is part of the global Skype problem since Thursday, May 26th, 2011 11:55 GMT
UPDATE: Working again.