IMac and Macbook Pro Networking Issue

Just recently both of my Macs have developed a wierd networking issue.  I am sharing folders on my Windows server (WHS), now this odd slow issue appeared when using a file from the server.  It acts like my network is really slow when opening a file, but my windows machines work fine on it.
I have not made any changes to the server, I am running a Gigabit Cisco network (not linksys) in my home and this thing has got me stumped.  I installed an anti-virus on the iMac and it found nothing.  Either wired or Wireless I see the same results but only related to the Mac's..... does anyone have an idea what might be doing this?  I am kinda a Mac noob in most aspects so I am looking for any help here.

It very well could be the antivirus app, most are intrusive and debilitate rather than enhance performance and should be removed using the developers instructions. You haven't really told us anything useful such as any settting you may have changed. However if you began working backwards resetting any changes and uninstalling the apps added since the performance issue started then you probably will find your issue. 

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