I am looking to purchase a wireless access point (possibly 2 if signal need repeating) to allow connectivity for a PC which will be located on the 3rd floor of a 3 story building. The wired adsl connection is located on the 1st floor approximately 6m from a stairwell which leads up to the 3rd floor the office where the PC will be located is approx another 35m down the corridor and the PC will be right in the corner of the room.
I know that there is quite solid concrete between the floors as the building is a residential home and wondered what kind of problem this may pose.
Can anybody advise on suitable equipment to allow the wireless connection and how they would go about setting up the access points?
Any advice on specific products would also be useful?

Any comments on this matter would be well received.