Welcome
Sounds like something is blocking your connection
Lets start with a clean boot and try to find out what
How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7
My guess would be the Firewall or AntiVirus
If that does not work
Run a full antivirus scan and download and run a full and updated malwarebytes.
If the above does not work, try in safe mode
If that does not work reset IE.
Internet Explorer - Reset
If that does not work try a system restore.
System Restore - How to
Proxy settings?
Make sure your settings are all correct. Time, region date etc