Can't access some websites. Possibly DNS problem.

This problem only started to occur a couple of days ago. I found that I can't access certain websites,but all the other computers in exactly the same network environment have no problem accessing them. I tried changing my DNS server settings from the servers my ISP provided to the Google DNSs, 8.8.8.8 and 4.4.4.4, and those websites I couldn't access before became accessible immediately, but some other websites, which I was able to access with the DNS provided by my ISP before, became inaccessible again. I tried using another set of DNS addresses, the same thing happened: some websites that I couldn't access before became accessible, but some others become inaccessible again. All these DNS servers that I used work perfectly on other computers in my network, so it has to be the problem of my computer. This has nothing to do with the browser, as all of the browers in my system have the same problem, even including the Internet Explorer in my VMware Windows virtual machine. I tried flushing the DNS cache with dscacheutil -flushcache, and it didn't work.
I'm using Lion 10.7.3 on MacBook Pro MC371. Please help!

Please give an example of a site you can't access now.

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    Blade79 wrote:
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    1 api (192.168.1.254) 1.083 ms 0.672 ms 0.637 ms
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