Try contacting a local priest to see if he will do a blessing of the house. If that doesn't work (or pisses it off) request an exorcism be done. Or ask an Indian (Native American) Medicine Man to smudge your place. That has worked for several houses that I know of that had "bad pookie". Depending on your religious beliefs, there are several avenues that could be traveled for this. I'm sure more suggestions will pop up before long.
Any idea where your spook came from?

A former resident possibly? Checking into that may lead you to a solution, depending on the entities nature.
Hope things work out for you.

I'll add you to my prayer list.