Win32.BO_Installer is a backdoor Trojan. These programs are much more dangerous because, unlike Trojans, these pests will open a backdoor allowing another intruder to enter. The intruder, once inside, will be able to perform a number of unwanted activities. Your computer could be taken over by a hacker!
Remove at Once
Win32.BO_Installer can be removed manually by searching for and removing all related files. You will also need to stop any and all of the running processes. Manual removal is usually not recommended as it can cause more harm than good if not done properly.
If you want the security that you will remove Win32.BO_Installer properly, you can put your trust in ZookaWare PC Cleaner. ZookaWare PC Cleaner is a spyware remover that guarantees to remove all spyware from your system or your money. You are not going to find much better than that.