It's likely that bronstab.exe is spyware or viruses. Backup your computer and remove this file, or perform a free scan of your computer to be certain.

bronstab and W32.Rontokbro.D@mm Worm can cause major problems with the security of your computer, and need to be scanned and removed. Adware and malware often masquerade as non-harmful files, so backing up your computer before deleting files is a very good idea.

For a quick and Free Spyware and Virus Scan, click here.

Since bronstab.exe is active on your computer, the chances that different kinds of spyware or viruses are still on your system are pretty high. Get a free scan of your computer by clicking this link.