Uniblue RegistryBooster is actually a Windows registry cleaner. It is not a virus in itself. It is a utility that searches for and removes unused/"orphaned" Windows registry entries.
Registry cleaners are only occasionally useful, usually after uninstalling a bunch of programs. They usually serve no other purpose; they are not antivirus software. Registry cleaners have the ability to edit the Windows registry; they can inadvertently worsen your Windows system if a necessary entry is mistakenly removed. Thus, only "power users" use these cleaners regularly.
I recommend you uninstall it; it's not necessarily doing harm, but it's probably doing you no good, either, and just wasting disk space.
