Used AppZapper to uninstall MacKeeper - then used MK's own uninstaller when prompted - please help

Question

HI
Whilst away on holiday recenlty, a relative has installed MacKeeper on his 2009 iMac (he's using Lion).  He thought it would be good to use before upgrading to Mountain Lion. He has asked me to look at the machine as it's now running slow.
Thankfully, he did the wise thing and to uninstall it when I told him to using AppZapper.  However, after doing this, MacKeeper's own unistaller prompt screen appeared and he told me he followed it's on-screen instructions to uninstall again.  I've never used the software on my Mac Pro as have read so many complaints of the last few years and was horrified when he told me he had.
If AppZapper has deleted MK's files (total of 24MB), is it safe to use the Mac without any rist of further problems.  Or, would it be a good idea to tell him to security wipe his hard drive after downloading Mountain Lion and making a DVD to run from startup.
Thanks in advance.
Matt

Answer 1

AppZapper, and other apps like it, don't work all that well and can cause other problems. They will often miss stuff. If you don't know how to uninstall a particular application, rather than using something like AppZapper, you should Google it ("mac uninstall softwarename").
In the case of MacKeeper, see:
http://applehelpwriter.wordpress.com/2011/09/21/how-to-uninstall-mackeeper-malwa re/
Note that, although many people refer to MacKeeper as malware, it actually is not. It is crap software made by a company that uses extremely unethical marketing practices, and should under no circumstances ever be used as certain functions (like the "cleaning" tools) can damage your system and even destroy personal data, but it's not actually malware.