How to remove definitions from Windows Defender?

I have been using my laptop with Windows Defender for a while and have updated it's definition archive everytime it tells me too.

Recently,
I thought that I should probably switch to a new anti-virus to help with performance.
So I installed Bitdefender's Antivirus Free Edition.

However, now there are definitions from previous updates of Windows Defender cluttering my Hard Drive.
Is there a simple and safe way to delete them?

Thank you very much.

You could run disk cleanup http://www.eightforums.com/tutorials/44274-windows-update-cleanup-windows-8-a.html

adamf said:

You could run disk cleanup http://www.eightforums.com/tutorials/44274-windows-update-cleanup-windows-8-a.html

Click to expand...

I am very sorry for the late reply.

What should I check to cleanup?

QuestionsToAsk said:

adamf said:

You could run disk cleanup http://www.eightforums.com/tutorials/44274-windows-update-cleanup-windows-8-a.html

Click to expand...

I am very sorry for the late reply.

What should I check to cleanup?

Click to expand...

The Windows Defender files...?

garydexter said:

QuestionsToAsk said:

adamf said:

You could run disk cleanup http://www.eightforums.com/tutorials/44274-windows-update-cleanup-windows-8-a.html

Click to expand...

I am very sorry for the late reply.

What should I check to cleanup?

Click to expand...

The Windows Defender files...?

Click to expand...

Oops, I meant the box. Which box should I tick?