Unable to connect macbook pro (lion) to internet

I have a macbook pro that is approx 8 months old. About 2 days ago I found that I cannot connect to the internet. The symtoms are quite confusing. I would first like to say that I can connect my wife's dell/win7 fine, I can also use my wireless printer which is connected to a win7 server, I can also use my IPhone and IPad. If I go into the macbook network configuration I can view the router. I can successfully setup a connection a get assigned a valid ipaddress. I am able to ping the router fine. It is just when I try to use the browser(firefox or safari) I can't connect to a site. I did reset the router a number of times with no change. I tried to get new ipaddresses by renewing the DHCP Lease. This will get me a new ipaddress but I still can't connect to a website. There is one very strange thing, if I go into my router's configuration page and get a list of connected devices I will see my macbook listed. If I hit refresh to update the list of devices sometimes the macbook is not displayed. I can refresh it again and then it will be displayed again. I am technically savy so I understand a bit about networking and routers, but this is really doing me no good. The is one thing that shouldn't have an effect on the connect, I recently installed Parallels, like I said this shouldn't have caused a problem like this.
HELP!!!
john

[Problem] Can't connect www.apple.com
The solution.
I have read several articles about changing DNS on the MAC.
I did not try to follow the advice of those articles because all we need is a simple, and all that we do not need is complicated.
  I open Apple > System settings... >  Network > and choose Wi-Fi, DNS tab.
There I saw
DNS Servers: 192 168.2.1
Search Domains: Home
With use the "+" on right side I replaced the "Home" to "www.google.com".
  Now I can connect to www.apple.com and I have a faster internet than ever before.
Also see
http://www.howtogeek.com/howto/38793/how-to-switch-mac-os-x-to-use-opendns-or-go ogle-dns/
http://www.howtogeek.com/79833/easily-add-opendns-to-your-router/
https://developers.google.com/speed/public-dns/docs/using
http://www.plus.net/support/software/dns/changing_dns_mac.shtml
http://macs.about.com/od/networking/qt/configure-your-macs-dns.htm

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