Hi, It's an error associated with a bad installer of "X" program> hard sometimes to pinpoint exactly which one.
I had this same type of error when closing the last IE browser window, and I just fixed it after reading some things about it.
I had uninstalled AVG free edition, in order to install the newer AVG 7.5 version, but it hung up, so I was thinking that would be the problem but it turned out to be something else! Read on!
Make sure you read this> http://ts.mcafeehelp.com/displaydoc.asp?frames=1&docid=402102&CategoryId=104037
If you have McAfee's Site Advisor installed, download a new copy
I downloaded the new copy, then closed all other windows, and
went to Add/Remove Programs and uninstalled SiteAdvisor, reinstalled with the new download, and no more NSIS error!
I did recall getting some kind of error in SiteAdvisor, but it was in Firefox, when I updated, the SiteAdvisor extension no longer was supported...so, I suppose that's what did it.
There are other things to try.... if not using SiteAdvisor, post back and I will see what we can get you.