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It should be fine to delete. As a test, chuck it in the Trash, restart and play around with the machine for a while. If nothing bad happens, then you know it's pretty safe to delete. It's a bug in OPSX that has let it grow this large. :)
 
Will anything bad happen if I delete a file called "windowsearver_last.log" from my computer.

And why the puck dose it need to be 13GBs?

I don't see a problem with deleting it... and 13GB??? Something was seriously screwed up on your system.
 
Then into the trash it goes.

FWIW, it's an OSX bug but it's nothing to worry about. It probably won't happen again. It's not a sign of impending doom. :)
Oh good.
What about this?
sad-mac.gif

Kidding
 

Love it! It'd make a good avatar! :)

FWIW, it's a _last.log... meaning that it's supposed to be swapped out. Meaning that it's just a back file, basically, in case you should want to look at it. By the time it becomes a _last.log (as opposed to /private/var/log/windowserver.log), it is already not in use by the OS.
 
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