I can't access Studio 2014 all of a sudden!

Hi everyone, I hope I'm in the right place, I'm rather flustered as I'm supposed to be working but can't get into Studio 2014 all of a sudden! I'm on the same laptop as always but it's started asking me to log in, which it hasn't done before, then when I log in it won't connect and I get the following message:

'The server is not responding. Please check that the server is available'

I've tried restarting the laptop but it made no difference. Any help would be much appreciated :-)

Thanks in advance,

Karen