I need a schematic (with its software) for a tested USB PIC programmer. I do have serial controlled programmers but they dont work with my laptop I request you to reply ASAP
Just search this forum for several different designs - the attached Pickit2 Lite being one of the best and easiest to build. ( you do not need the ferrite bead )
All the software is free to download from Microchip, you will need to program the pic18f2550 from your existing programmer.
Note that a few Laptop USB powered programmers can give problems because the laptops usb port cannot deliver adequate power, a powered usb hub usually cures that problem.