Possible glitch happening - early warning

[#1]

I clicked on modify a post in IE8 and got this popup.
Using the browser back button and trying again worked

[#2]

never had that in ie8 yet and modify nearly all my posts.
maybe somthing to do with your admin account

[#3]

First time for me as well which was why I flagged as there may be a database corruption hiding somewhere - but then again what would I know I'm only a user 

[#4]

You sure it's not Kaspersky again?

[#5]

I had this error over the weekend but I'm damned if I can remember what it was I was doing when it happened.