More than likely your network administrator has those sites blocked for security purposes. You'll need to discuss how to work within the corporate policy to gain access on your personal machine with the network administrator. We can't help you bypass what ever security is in place at your place of employment.
From the [url=https://www.bleepingcomputer.com/forum-rules/]Forum Rules[/url:
No subject matter will be allowed whose purpose is to defeat existing copyright or security measures. If a user persists and/or the activity is obviously illegal the staff reserves the right to remove such content and/or ban the user. This would also mean encouraging the use or continued use of pirated software is not permitted, and subject to the same consequences.
I have bolded the relevant part of our forum rule relevant to this.
The Internet is so big, so powerful and pointless that for some people it is a complete substitute for life.
Andrew Brown (1938-1994)
A learning experience is one of those things that say, "You know that thing you just did? Don't do that." Douglas Adams (1952-2001)
"Imagination is more important than knowledge. Knowledge is limited. Imagination circles the world." Albert Einstein (1879-1955) Follow BleepingComputer on: Facebook | Twitter | Google+