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Usually this is caused by your ISP's DNS servers, and as such can be easily fixed (which will also speed up your browsing of the Internet). The solution for this is to change your current DNS servers to Google or OpenDNS public DNS servers.

Second most popular reason is if you're using Hamachi - as they just blatently use public IP ranges for their own private network, and hence block access to sites in those IP ranges in the real world. So if you're using Hamachi, it's time to get rid of that bug riddled old piece of no-good software.

Changing DNS server settings on Microsoft Windows 7:
1. Go the Control Panel.
2. Click Network and Internet, then Network and Sharing Center, and click Change adapter settings.
3. Select the connection for which you want to configure Google Public DNS. For example:
To change the settings for an Ethernet connection, right-click Local Area Connection, and click Properties.
To change the settings for a wireless connection, right-click Wireless Network Connection, and click Properties.
If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
4. Select the Networking tab. Under This connection uses the following items, select Internet Protocol Version 4 (TCP/IPv4) or Internet Protocol Version 6 (TCP/IPv6) and then click Properties.
5. Click Advanced and select the DNS tab. If there are any DNS server IP addresses listed there, write them down for future reference, and remove them from this window.
6. Click OK.
7. Select Use the following DNS server addresses. If there are any IP addresses listed in the Preferred DNS server or Alternate DNS server, write them down for future reference.
8. Replace those addresses with the IP addresses of:
The Google DNS servers:
For IPv4: 8.8.8.8 and/or 8.8.4.4.
OR
OpenDNS DNS servers:
For IPv4: 208.67.222.222 and/or 208.67.220.220.
9. Restart the connection you selected in step 3.
10. Test that your setup is working correctly
11. Repeat the procedure for additional network connections you want to change.

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