You may have made a mistake somewhere along the way when forwarding port 8333. Try again.
Also, you could try disabling manual forwarding in your router and enabling "Map port using UPnP" in Settings->Options. Restart client after enabling it.
If all that fails, open cmd and enter these commands
cd C:\program files\bitcoin
bitcoin.exe -addnode=69.164.218.197 -addnode=64.22.103.150 -addnode=173.242.112.53 -addnode=178.79.147.99 -addnode=184.106.111.41 -addnode=91.85.220.84 -addnode=173.224.125.222 -addnode=86.5.50.90 -addnode=178.255.199.86