developing usb drivers for pic

hey guys, whats im trying to do is to develop a usb driver for my gtp-lite for windows 7. the current driver only supports windows xp and theres a one for vista too apparently but i couldnt find a driver that works for windows 7. i tried contacting the original developers but they have given up development a long time back.
so it would be great if you guys could point me in the right direction on how to build the actual driver. if it requires a particular language im quite ok with java and c.
the pic on the programmer is 18f2550. will i need to change the firmware on the programmer aswell? in that case does anyone have the original source code?

p.s - i know it'd be much easier to just purchase a new programmer with windows 7 support but my intention here is not just to get the programmer working but also to get some insight into working with usb platforms and i like this programmer.. it supports all the pics ive so far had to work with

thanks

I found some useful discussion in https://www.electro-tech-online.com/threads/gtp-usb-lite.32796/

I'd personally build a PicKit2 clone as it's not much more complex and you can do incircuit debugging.

Edit, it may be a PicKit2 clone. Have you tried the drivers from Microchip? Edit2, no it isn't.

Mike.

I know that Sparkfun and microchip had some nice discussion regarding the USB driver and control. May worth a 5-10 minutes of exploration there.

For your information, don't even bother with driver in java...Java isn't made for this purpose. Stick to C or C++. Most of the driver are written in those language...or assembly for extreme gong-ho.

Simon

+1 on the PICkit2.