hahaha!
we have all been there at some point

Usually for Internet Explorer, you can go to your desk top (where all the icons are) and right click the IE icon and choose properties.
You will see a box to let you delete cookies, another for delete files.
Just be sure you know all your passwords before clearing all the cookies out

Click on the one for deleteing cookies and allow it on the pop up that appears.
Delete files lets you knock out all the internet content storage and the offline site stuff too.
Do this when the browser is closed also, so it will get all the cookies etc.
Then log back onthe site and check it out.