Not much detail there that we can help you with.
Blue screen is generally caused by an interruption in the signal between your Sky+ box and your TV. You could try replacing the cable.
I assume you've turned off the PIN requirement in your Sky box settings. A PIN is still needed under some circumstances as required by OFCOM's mandatory daytime protection regulations.
The 'all round bad expereience' is too vague for us to be able to comment.
