I have had Norton for years but should I switch to Mackeeper and is it better?

My anti virus renewal is due soon and am wondering if I should stay with the basic Norton which I have for years or switch to Mackeeper?  Which one is better and will speed up my desktop computer as it tends to be slow and the colored cursor is annoying.

Norton Antivirus has a very long and illustrious reputation for mangling Mac OS X systems, sometimes to the point where a complete reinstall is necessary. Among other things, it installs kernel extensions which are known to cause kernel panics and system freezes; it contains known and documented bugs which can silently corrupt Adobe Photoshop and Adobe InDesign files, destroy a user's ability to authenticate as an administrator, and (on PPC systems) can cause Classic to stop functioning; and Symantec has on at least two occasions now released flawed .dat file updates which erroneously report certain critical Mac OS X files as "viruses." (Deleting these "viruses" causes damage to the system that in some cases renders it unbootable.)
Mackeeper is malware.  How to uninstall MacKeeper malware:
http://applehelpwriter.com/2011/09/21/how-to-uninstall-mackeeper-malware/
You may find this User Tip on Viruses, Trojan Detection and Removal, as well as general Internet Security and Privacy, useful:
https://discussions.apple.com/docs/DOC-2435

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