There's many things that could cause this, I've listed them all below.
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Open IE, go to TOOLS > Internet Options > Advanced and scroll to bottom of list. Options there are for SSL, TLS, etc. Make sure they are all on.
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Open IE and click Help, About Internet Explorer Look at Chiper
Strength it should be 128 bit.
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Download and install Sun Java (I know it may sound daft but it did help someone in a similar problem)
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Change your MTU settings in WAN to 1492
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Control Pannel > Administrative tools > Local Security Settings
Open up Local Policies > Security Options
Verify that "System Cryptogrophy: Use FIPS compliant algorythms for encryption" is set to disabled.
You will need to restart the system for this to take effect.
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Also try and download
Mozilla Firefox and see if the problem happens in that browser.