What does anyone know about Sophos antivirus?

I Had a tech guy install it on my computer and my Mac desktop was so slow and I uninstalled it and was wondering about it

Completely uninstall Sophos Antivirus.
Commercial Antvirus solutions can negatively impact OS X performance and can cause other operational issues with OS X.
http://www.sophos.com/en-us/support/knowledgebase/119182.aspx
Here my tidbit of advice on how to avoid viruses in the future, if you encounter a virus, again.
Some anti-virus solutions can slow down your Mac, but to be honest, the best anit-virus app is you, the user and your brain.
Don't visit questionable websites or website you are unsure about.
Don't use Torrents or engage in "Torrenting"
Don't install pirated software or software downloaded from a questionable or unknown websites or untrutsted sources.
Java is still a vulnerability concern,  if you do not need it, don't use it.
Use a browser filter and pop-up blocker
Don't open email attachments from email addresses that you do not recognize.
Install security updates when they become available
Educate yourself as to what threats are common and active.
In effect, use your own brain as the antivirus filter.
Follow that advise and in MOST cases, you will be fine and won't risk your Mac to potential Trojans, malware or viruses.
If you feel you need some baseline virus protection that is minimally invasive on the Mac OS X system, install
ClamXAV
http://www.clamxav.com/

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