Why not go with antivirus software that is well known and has been repeatedly tested by independent labs and journalists. I use AVG Free and am pleased with it, and it does a good job at blocking malware. Avast is also good - and free. PCKeeper may be fine (or not), but I don't like to gamble with unknown software, and I don't have time to waste partitioning a drive to test it myself. PCMag just published their choices for best antivirus for 2013, which looks at a ton of choices (but not PCKeeper). You might want to look at some of those choices instead.
Answer
Why not go with antivirus software that is well known and has been repeatedly tested by independent labs and journalists. I use AVG Free and am pleased with it, and it does a good job at blocking malware. Avast is also good - and free. PCKeeper may be fine (or not), but I don't like to gamble with unknown software, and I don't have time to waste partitioning a drive to test it myself. PCMag just published their choices for best antivirus for 2013, which looks at a ton of choices (but not PCKeeper). You might want to look at some of those choices instead.