Are you sure it is a MKII or is it a v2 ?
Today I received from a HK company (via eBay) a STK500 USB clone.
It uses an USB serial chip to make it look like a com port. It took me about an hour to figure out what was going on because it arrived with ZERO documentation.
I determined that I had to edit the boards.txt file and add these lines:
Do an eBay search for "ATMEL STK500 Programmer for Arduino & Freeduino Board" to see what I got.
FYI: Switch 1 should be off, Switch 2 should be ON.
Tonight a built a boarduio and programmed a bootloader on a new ATMEGA chip via the ISP plug. I am now able to use the Arduino software ok on that newly bootloaded chip.