Of course work laptops are for work, and should only be used for "company purposes". So, how do some people justify installing games on their work machines:
"It's part of the operating system - Windows won't run unless I install these games. Really."
"By installing on my main work laptop, I'm using that laptop more, so I'm more familiar with how it works and I can more easily check work-related tasks (like email and IM, and things that require the VPN)."
"These games have technical educational value, and are therefore not really 'games', but rather learning tutorials that benefit the company."
"I'm not 'playing the game', I'm studying it to better understand how to make functional user interfaces."
"I'm just analyzing the deployment experience so I can glean from it and apply it to our own product."
"This isn't really a game, it's actually a test project that I wrote myself (such as with XNA or Silverlight)."
"This game was built by one of our clients, so I'm just studying their products to help me conduct better client outreach."
I'm sure there's more.