Is there a ghost in my house??

This started about 5-6 years ago. I feel the presence of someone else in my house. Though I have never seen anything, I know there's something there. I've got vivid flashes and images of an old, white haired woman wearing a long black robe, but the face isn't recognizable, and I can't see any features. When I'm in bed at night, I "feel" her standing over me, and get totally freaked out. I have a small computer room at the end of my hall, which is always freezing cold, and there's a strange feeling of uncertainty and unease when you go into it. It's also where a baby picture of myself is, and it was ripped down from the wall. I've stopped hanging it up now. Also, my wireless router is in there and it regularly disconnects, and when I go in to reset it I get freaked out and feel uneasy.. I do believe that we are not alone in this world, and that there are spirits - but I'm just freaked out. Incase it's important, the people who lived in my house before us, were an old lady and her husband. The old lady died on the doorstep in front of the neighbourhood kids, I'm sure she just dropped dead. I never found out what she looked like, but my mum did find pictures of the family when we first moved in, though they were really old and she binned them.. The husband died in a hospital. I've thought that the "woman" in the house may be the woman who died here.. I don't know. My mum hates to speak about it, so I'm sure she knows also.

What's happening in my house?? Nothing shocking has ever happened, I just don't feel comfortable in my home, but when I'm at other people's houses I feel totally fine and am able to sleep at night without pulling the covers way over my head and wondering what's leaning over me (sounds so dumb lol)

Thanks if anyone answers. Also, how can I see this spirit/make contact with it??