will high siera,mackeeper and chromium harm my Mac

High Sierra is the current Mac operating system (see Apple menu > About This Mac).

Malwarebytes has a good reputation and it will remove Mackeeper and other malware. Malwarebytes | Free Cyber Security & Anti-Malware Software

Do not install MacKeeper (and how to uninstall it if you have):

https://discussions.apple.com/docs/DOC-6221

How to uninsrall it:

http://applehelpwriter.com/2011/09/21/how-to-uninstall-mackeeper-malware/

It contains a major security flaw, recently noted:

http://www.macnn.com/articles/15/05/08/contentious.utility.ignored.apple.guideli nes.created.zero.day.exploit.128538/

There is currently a class-action against MacKeeper:

http://www.macworld.com/article/2927032/ads-for-mackeeper-refunds-will-run-on-fa cebook.html#tk.nl_mwbest

(Please note that references to the original developers, Zeobit, also now refer to Kromtech Alliance Corp, who acquired MacKeeper and PCKeeper from ZeoBit LLC in early 2013.) And in that context the foregoing also applies to their latest offerings,Advnced MacKeeper, AdwareBuster and AdvancedMacCleaner ,which were quickly found to not identify much of the adware around.

How to delete Mac keeper manually .

Enter in System Library - Click on finder and take cursor on top menu bar , click on Go > computer > Macintosh HD

( a ) Applications - Mac keeper app

Click on library .

( b ) Launch Daemons

com.mackeeper.AdwareAnalyzer.AdwareAnalyzerPrivilegedHelper.plist

com.mackeeper.Mackeeper.MackeeperPrivilegedHelper.plist

( c ) PrivilegedHelperTools

com.mackeeper.Adware.AdwareAnalyzer.AdwareAnalyzerPrivilegedHelper

com.mackeeper.Mackeeper.MackeeperPrivilegedHelper

Enter in User Library - click on finder > Go > hold option key > Library , these are the locations where malware hide .

( a ) Application Support

Folder - com.mackeeper.AdwareAnalyzer

Folder - com.mackeeper.MacKeeper

Folder - com.mackeeper.Mackeeper.Mackeeper.Helper

Folder - Mackeeper - and its subfolder - statistic 2

Folder - Mackeeper 3 - and its subfolder - NE notifications

( b ) Launch Agents

Folder - com.mackeeper.AdwareAnalyzer.plist

Folder - com.mackeeper.Mackeeper.Helper.plist

( c ) Logs - Mackeeper.log

Mackeeper.log.signed

( d ) Preferences

com.mackeeper.AdwareAnalyzer.plist

com.mackeeper.Mackeeper.Helper.plist

com.mackeeper.Mackeeper.plist

( e ) Saved Application state

com.mackeeper.Mackeeper.savedstate

( f ) Caches

Folder - com.mackeeper.AdwareAnalyzer.plist

Folder - com.mackeeper.Mackeeper.Helper.plist

Folder - com.mackeeper.Mackeeper

These folders / subfolders and related .plist are dragged and dropped to the trash .

Also if the app is in download folder it is moved to the trash .

Restart the Mac from apple logo and empty the trash .