How do I enable / disable or delete Internet cookies?

Go to the 'View' menu
Click 'Internet Options'
Click 'Advanced'
Tick the box that says 'Prompt before accepting cookies'
Now go into your cookies directory (usually c:\windows\cookies
Delete all the files you have there

you should delete them in the SE history)

delete history

For Mozilla Firefox

Enabling Cookies

First Click the “Tools” menu, now click the “Options” then clicking the “Privacy” button, now under “Cookies” check the “Allow site to set cookies” option.

Disabling cookies

First Click the “Tools” menu, now click the “Options” then clicking the “Privacy” button, now under “Cookies” uncheck the “Allow site to set cookies” option.

Deleting cookies

First Click the “Tools” menu, now click the “Options” then clicking the “Privacy” button, now under “Cookies” click the Clear button.