I got one of these

USB ISP from ebay

and one of these

http://www.futurlec.com.au/ATMega_Controller.jsp

Then using this

http://winavr.sourceforge.net/

You get programmers notepad (with the built in AVR-gcc compiler) and the AVRdude with USB library

C:Documents and SettingsuserDesktoptest>avrdude -p atmega128 -P usb -c usbasp -U flash:w:main.hex

This will flash the chip with the main.hex file

This command should be able to be incorporated into programmers notepad

Get the ISP driver USBasp-driver-0.1.12.2

The ISP user guide Users Guide (AC-PG-USBASP-UG-V1.2)