Windows 7 cannot now access certain websites after ISP upgrade

OK. Firstly let me say I was lucky to be able to load this page.

I recently upgraded my ISP service. Faster speed.

Since that time however, I have been unable to load my everyday websites such as www.my.yahoo.com, www.facebook.com and many others. I can load www.google.com and www.yahoo.com and do a search.

After spending a couple of days on this. I decided to do a complete new install of Windows 7 on a new hard drive to see if anything different by way of results happened. Using Explorer 8 which was on the installtion it didn't. I could go to those websites as previous, ie.' but if I tried to download for example GoogleChrome@www.google.com or Firefox@ mozilla.com it timed out. This also happened attempting to get Explorer 9. I could also go to www.yahoo.com, do a search but as soon as I attempted to access my email that way instead of using my.yahoo.com, again it would fall over and timed out

Running diagnostics by microsoft gives me no problems. I have internet connectivity.

I removed my Router from the equation and made a direct connection using the ISP's modem.

I have spent over 31/2hrs on the phone, most of that waiting and am no further ahead. I had to go to my phone providers page to buy more minutes. Sure, I could load the homepage but guess what. That's as far as it would go. It timed out after hitting "buy"

Has anyone any idea's?