Audacity (google it as it is free)
Something with a headphone port
A 3.5mm to 3.5mm audio jack
Connect the Tape player to the PCs mic port and use audiograbber to record the output. It is a 1:1 process but can be set up overnight. Easy to do but takes quite a lot of time. There are machines to do it but these give little better quality and cost a lot more than the only item required to be purchased here which is a 99p cable from a pound shop or £3 or so at maplins.