How do I check for Malware? I have a 4giga IMac and she is using 3.9 only running Safari.

I have IMac OSX 10.9.4, 4GB,Processor 3.06 with Intell2Duo. I would like to check for Malware. I run a TechTool Pro 6 every month and that comes up great.
When check how much memory I am using, with only Safari open I am using 3.9 and more of her 4.0 memory. She is very. very slow in processing. I had 4000
trash to clean out and it took her over an hour to expel. Also for some reason Safari will not allow me to click on a link, in my G-mail, and let it go to the page.
It has a sign saying a pop-up blocker is on and will not let me do it. I must open the stamp to look at my e-mails and if I have redirected link now I can do it.
I have not changed my preferences so where is this pop-up blocker?
I have looked at preferences on Safari and Google, which I do not understand Google, and do not see where this blocker could be.
Malware is something I want to make sure is not on my computer. Tech Tool Pro 6 is all I know of and it does not detect Malware.
Help.
Ceil

Your not running windows.
Apple provides malware detection and removal as part of Mac OS X.  A lot of the mac os x supposedly malware detection tools are malware themselves.
When check how much memory I am using, with only Safari open I am using 3.9 and more of her 4.0 memory.
Mac OS X uses all the memory it can to improve performance.  I'm not familiar with Mavericks to know if this is a problem or not.
She is very. very slow in processing
This is a problem. Doesn't mean you have malware.  You could have installed some app with a bug,  etc.
1) You want to look in
/Applications/Utilities/activity monitor
& see what the problem apps are.
2) Run etrecheck.  Post results here. The author of this tool partipates in ASC.
http://etresoft.com/etrecheck

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