The most common way to get around a website blocker is to change the proxy or DNS settings. Alternatively, a VPN or Tor service can be used.
To change the proxy settings, in Internet Explorer, click Tools and click Internet Options. Once there, click on the Connections tab, and then click LAN settings. Uncheck the box that states "Use a proxy server for your LAN," and click apply.
To bypass blockage due to DNS settings, change your DNS servers to that of a public DNS server, like Google Public DNS (126.96.36.199 & 188.8.131.52).
If both of those options fail, a VPN (virtual private network) will route all traffic from the computer to a specific endpoint. There are many options on VPN endpoints. Many home routers can double as a VPN endpoint. Others, such as Private Internet Access, provide multiple VPN endpoints for a fee. It is best to judge the requirements of the connection before committing to a specific VPN.
Lastly, Tor uses a special routing protocol, to route traffic through encrypted network nodes before emerging at an endpoint which will likely be in an uncensored, unfiltered location. Tor will allow for access to blocked websites, but traffic will flow much slower, due to the routing protocol. The most common way to access the Internet using Tor is to use a Tor Browser, which can be downloaded at torproject.org.