My iMac will only connect to certain websites?

When I first started up google chrome on my iMac today, the start up page (google) wasn't loading. I decided to try other websites such as youtube, twitter, tumblr, and Facebook. Out of all the websites I tried, Facebook was the only website the loaded up (and very quickly at that). I decided to try the google search bar to see if it would work and it did, but some links that I clicked didn't load up. I tried following some advice I found on some forums, but none of them worked. I cleared my cache, got rid of login items, fixed up my desktop, restarted my router, and a few other things, but nothing. It worked fine two days ago (didn't use it yesterday), but now it's just really sucky. The Internet works fine on my ipad and my brother's dell laptop so my iMac has to be the problem. Can someone help me out? Btw, I haven't upgraded to Lion yet, since I'm waiting on my day to pay for it, plus the Mac App Store doesn't work until hours after I've started up my iMac..

That tick is OK.
Not that you should have to mess around with your settings, but you could try adding OpenDNS numbers to your network settings:
http://use.opendns.com/#mac
Info about OpenDNS:
http://www.labnol.org/internet/tools/opendsn-what-is-opendns-why-required-2/2587 /

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