IE Stopped working

[#1]

Using IE9 on Vista. I've been away from the pc for a few hours and on returning started browsing using IE and keep receiving a 'The webpage is unavailable because you are offline' message. I am, however, able to use Chrome successfully. Any ideas? 

[#2]

Click "File" on top tool bar...... check to see if you have "Work Offline" checked.....

[#3]

I was going to suggest that but it's not there in 11 so wasn't sure if it was still there in 9.

[#4]

You're both absolutely correct, thank you both.....    I have no idea at all how that happened  

[#5]

Its on the bottom toolbar

[#6]

A further read and it's been removed totally from 11.

[#7]

As a secondary question, should I update to IE11? Is Vista supported ?

[#8]

From memory I don't think either IE 10 or 11 are supported in Vista.