Internet connection speed slowed down

I have an eMachines W1500 computer with XP. My question is:

I had my computer in a room in my house. It always connected at 56.6 or something like that. (dial up) I ended up moving it to another room but kept the SAME cord and SAME phone jack. In that room, it connected at 42.6. I moved it back to the original room and it connected at 56.6 the first few days, now it is connecting back at 42.6. I don't see how moving it could have changed my connection speed, since it stayed on the same phone line and phone jack, but I have no idea why is does this. Is it my ISP??? Is it my computer?

I have Spybot, CCleaner, Ad-aware, and Spyware Blaster on my computer.

 

More likely just the quality of the particular connection at the time you dial in. Poor line quality equals more errors, thus the modem falls back to a speed it can reliably transmit and receive at more consistently.

Try this: plug a phone into the jack in "the other room", pick up the receiver, and dial a single digit. Listen for hum or static. Do the same at your regular jack. See if there is a difference. If you hear hum or static at both, you may need to address whether or not you have an inside wiring issue that needs correcting. The remedy may be as simple as opening the jack in the room where it's slower and scraping oxidation from the wires where they are screwed down iside the jack.

If you have a modern NID (Network Interface Device) outside your house, you could potentially open it up and plug a phone directly into the jack inside it to see if the hum/static is from the actual phone service to your home, and thus the phone company's responsibility to fix.

At the speeds at which you say you are connecting, my guess is it's probably more likely the connection you are getting on an individual session. In the room where you experience the slower speed, when you get a slower connect, try hanging up and waiting a few minutes to reconnect and see if it makes a difference for the better.