Certain websites will load eg. Facebook, Google, etc. but others, eg. YouTube will not open. Why? And how can I fix this?

Firstly, I downloaded the latest edition of Firefox. It then crashed several times in a row. This is when certain websites stopped responding and refused to open. I don't know what the criteria are for which websites open and which do not as I have no problems with sites such as Facebook, Google, etc. yet sites such as Youtube won't open.
Also, If I search for something on Google, once it returns results, I cannot open certain websites from the links given to me by Google.
Eg. if I search Google for Musicnotes.com, I can click the link and the page will open. But if I search for my university website, the page won't open.
When I closed Firefox and went to reopen it, all I got was the "send error report" screen several times over. If I clicked "Close" or "Restart" Firefox, nothing would happen, it just returned me to the "send error report" screen. I then restarted Firefox in safemode as well as restarting it without add-ons. But I am having the same problems with opening websites.
What can I do?

Do a malware check with several malware scanning programs on the Windows computer. 
Please scan with all programs because each program detects different malware. 
All these programs have free versions.
Make sure that you update each program to get the latest version of their databases before doing a scan.
*Malwarebytes' Anti-Malware: http://www.malwarebytes.org/mbam.php
*AdwCleaner: http://www.bleepingcomputer.com/download/adwcleaner/ http://www.softpedia.com/get/Antivirus/Removal-Tools/AdwCleaner.shtml
*SuperAntispyware: http://www.superantispyware.com/
*Microsoft Safety Scanner: http://www.microsoft.com/security/scanner/en-us/default.aspx
*Windows Defender: Home Page: http://www.microsoft.com/windows/products/winfamily/defender/default.mspx
*Spybot Search & Destroy: http://www.safer-networking.org/en/index.html
*Kasperky Free Security Scan: http://www.kaspersky.com/security-scan
You can also do a check for a rootkit infection with TDSSKiller.
*Anti-rootkit utility TDSSKiller: http://support.kaspersky.com/5350?el=88446
See also:
*"Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

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