How to UNINSTALL software?

I am having serious issues w/ my Mac (ie. Safari and other apps "unexpectedly quit", unable to open apps if other apps already open, desktop and Safari loading VERY slowly). I took my mac to a local Apple store, and it looks like I need to uninstall the Virex software that came pre-installed on my mac.
It was also suggested that I archive and re-install my whole OS!
I'm somewhat intimidated by the thought of messing w/ my OS, so I've muddled along w/ the same issues for several months now, doing quick, minor fixes to get me by (ie. closing open apps to use other apps, resetting Safari and the cache, trashing library .plist files and the icons folder). My usual quick fixes don't seem to be helping now, sooooo....it looks like I have to get down and dirty now.
How do I uninstall the Virex software that came already installed on my Mac?
How do I archive files (and what files SHOULD be archived, for that matter) and uninstall/reinstall my OS?

KSilver:
Take a look at Dr. Smoke's FAQ on Multiple applications quit unexpectedly or fail to launch and see if it offers any help.
In addition to John's suggestion to run Unix Maintenance (CRON cleaning) you may need to do some other maintenance. Gulliver offers good advice in Mac OS X System Maintenance.
Please post back with further questions or comments.
Good luck.
cornelius

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http://konstochvanligasaker.se/apptrap/
-Bmer
Mac Owners Support Group - Join us @ MacOSG.com
  Mac611 Mobile Mac Support - about.Mac611.com
   iTunes:MacOSG Podcast | YouTube.MacOSG.com
                   An Apple User Group 
Have an iPhone or iPod touch? Enter Mac611.com in Safari on it for 'mobile Mac support.'

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See these:
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Quick Assist,
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Uninstalling Software: The Basics
Most OS X applications are completely self-contained "packages" that can be uninstalled by simply dragging the application to the Trash. Most applications create preference files which are stored in the /Home/Library/Preferences/ folder. Although they do nothing once you delete the associated application, they do take up some disk space. If you want you can located them in the above location and delete them, too.
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SuperPop
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For more information visit The XLab FAQs and read the FAQ on removing software.

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how to uninstall a software in mac os x 10.8

Welcome to the Apple Support Communities
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*Uninstalling Applications*
First, I suggest backing up your drive in case you uninstall something you shouldn't have uninstalled.
Most small programs can have all their components contained within an app package. After running, the program will likely install a file in Preferences (either in your user area, or the main preferences, or both). Dragging a program and its preferences to the trash is often all that is needed, or you can use a program like AppDelete to delete these programs. However, most application deleting programs will not have an inventory of what is installed -- they just look for files that are clearly associated with the application you are deleting.
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[X Lab FAQ: Uninstalling applications|http://www.thexlab.com/faqs/uninstallingapps.html]
[http://guides.macrumors.com/UninstallingApplications_in_Mac_OSX]
[Apple Discussion with useful tips|http://discussions.apple.com/thread.jspa?threadID=1963113&tstart=0]

HT201210 how to uninstall the unauthorized modification software?

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