Everything looks configured correctly, but your proxy is throwing a bunch of errors.

Hopefully someone else can chime in on that.

Have you tried BFG Miner, I see you are using Windows 7, so unless it is starter it is most likely 64 bit. Download the 32 bit version anyway and give the "--http-port 8330" flag. You can then have it connect to slush pool and change your port on the blade to 8330.

Also, are you running bitcoin-qt in server mode on the same computer?