You really are serious, aren't you?
Don't need fancy equipment. Turn flash on camera, take pictures in all the rooms. Record yourself asking if anyone is there on a recording device. Load pictures to computer and look at them very carefully. Slow down voice and listen carefully. :D
I don't know about for you pc but if you have a smartphone I have an app called Ghost Radar, works like a charm ;P
Make sure you are not alone when you do it.
cuz it really scary!
You don't need no software. Just use voice recorder.
You really need to stop watching Paranormal Activity movies and sequels.
I can do this remotely from here... wait... checked.. you dont.
Well, there are various software that measure EVP/EMP, software that records white noise, or trasmutes EVP into words, but I don't believe in ghosts so I'm sorry. Your best bet is to smoke a whole lot of dope.
invest in an emf reader, some ir goggles, a digital thermometer, and an rf meter
Flakeware 2.0 should do the trick.
The Bible :)