Strange Google Error?

I received this message while trying to access Google from work all day.

We’re sorry…

… but your query looks similar to automated requests from a computer virus or spyware application. To protect our users, we can’t process your request right now.

We’ll restore your access as quickly as possible, so try again soon. In the meantime, if you suspect that your computer or network has been infected, you might want to run a virus checker or spyware remover to make sure that your systems are free of viruses and other spurious software.

We apologize for the inconvenience, and hope we’ll see you again on Google.
To continue searching, please type the characters you see below:

Did anyone else experience this or was it just me? It happend on Mac and PC across every browser I tried. As you can see from the message, it required me to type in random characters from an image to access the page. Every time I did it would let me in, then after a while I would try again and get the same message. Weird.

One thing though, I usually accessed the Google personalized homepage when I received the error, but when I went to Google.com the error persisted.