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Don't know if you still have the issue, I recently started having this issue (seemingly out of no-where); just thought I'd post my fix. I have SuperAntiSpyware on my computer (I'm not advertising for them, just don't want anyone to go through all the long hours I went through), there's a tool in the "Repairs" section of SAS called "Repair broken Network Connection (Winsock LSP Chain)". As the program states, please use with caution. Once I ran that, I had to restart as it did something in the registry. Once it came back up, BAM, fixed; after about a month of trying to fix it... BTW, it says it's only for Window Xp (the tool), but I used it on my Windows 7 Ultimate 64-bit, no issues. Hope this helps :-)