non sorry I just have one computer

My problem is that I can't mine.
I am subscribing to SlushPool and when I complete the required fields GUIMiner this message appears "Connection Problem"

Hello everyone

I've been trying for a few days to mine with Guiminer but after completing fields Guiminer, I still get the following message:'connection problems.
I have a Pentium(R) Dual Core CPU E5700 3GHz and Intel (R) G45/G43 Express chipset graphics card and I'm on windows 8.1
 
Can someone help me please?

Thanks a lot