imac not connecting to Internet

Hello I have an imac running os x v 10.5.8 2.4ghz Intel Core 2 2 gb memory it's on the same network as other systems but every now and then this system just not connect to the Internet but the network is up and I don't get any warning message on the mac ...I went into my network utility it's states I have an ip address and it's active but it will just spin and spin and no page will come up then out of the blue it will just start working.... I am not a mac person but on a pc I think malware bytes ....any suggestions
Deerek11Asked:
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strungConnect With a Mentor Commented:
Go into Network Utility, click on the Advanced Tab, then then the DNS tab.
Highlight any DNS entries that are not greyed out and use the minus button on the bottom to remove them

Then use the +  button to replace them with
8.8.8.8
and
8.8.4.4

Let us know if that helps.

See screen shot attached.
Screen-Shot-2013-12-10-at-11.56..pdf
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Deerek11Author Commented:
I just added those address in the dns server and I am still connected should I leave it like this a for a few days to see ...Also I don't need to be worried that this could be malware
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Deerek11Author Commented:
It does seem to slow down the browsing
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strungCommented:
Here is a free antivirus program if you have concerns:

https://www.macupdate.com/app/mac/15850/clamxav
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