Wouldnt bother.If it aint broke why try and fix it.
If you dont want it running in the background and you think you have malware use adwcleaner
Yup ^ Dont get dodgy files / dont go to dodgy sites, you wont need one
Altho I wouldnt use Mbam 3 until they fix the crashing. Looks like a few people have been getting crashes with it lately