Download Spybot Search & Destroy to scan and remove it. (you may be told to schedule running Spybot S & D on the next restart). click here
Or to do it manually, open Task Manager, Processes tab, find msbb.exe, highlight it, and click End Process.
Then go to the folder (you to have enable show hidden files and folders to see it) and delete the file manually.
Then use msconfig, Startup tab, and untick the box for msbb.exe. Click OK.
If the file came with certain downloaded software, the software may not work, but frankly there's so much decent freeware around I'm sure you can find a better alternative.
It may have already downloaded other stuff to your computer, so better run Spybot S & D.