You just need a cheap card reader, something like this:
http://amzn.to/LhxyS6
By 'memory stick' do you mean as in MemoryStick - Sony's version of the SD card - or a USB flash drive (pen drive)???
Either way, just plug the card reader into your computer, insert the SD card, copy the files to your computer's Desktop, and repeat with the other SD cards until you've copied all the files you want to transfer.
Then, if it's a MemoryStick, insert that into the reader and just copy the files from the Desktop on to it. If it's a pen drive, insert that into the USB slot (instead of the card reader) and do the same.
Hope this helps!?!