Multiple instances of "Microsoft (R) Visual C++ Package Server (32 bit)"

Any idea why is this happening? And how to stop it?

(image pending until MS verifies my account: a screenshot of Task Manager showing 6 instances of Microsoft (R) Visual C++ Package Server (32 bit), each using about 500 MB memory)

Apparently it starts a new instance each time I hit compile. (Edit: actually, it happens randomly. I'm simply writing code when I receive the low memory warning. I check the Task Manager and there are 6 instances of that thing.)

I'm using VS 2013 update 2 (12.0.30501.00), compiling an Unreal Engine 4 project.