Error [252] when flashing any ROM

[neuteboomt]

I am running windows 7 pro 64bit and on a second machine 32bit and receiving connection error 262. Now keep in mind that I have flashed many custom ROMs to this device before. The phone has also been unlock with unlocker 2.31some time in mid 2009.

I was able to sync the phone with no problems, it was very streamlined and auto updated the drivers from the web.

My problem was when the OEM Rom Update Utility switched into the coke bootloader mode. It dropped the USB connection and then tried to re initiate just like normal, at this time win7 downloaded a new driver. After that, the update utility stayed on the PC screen with 0%, the phone however never switched out of the coke screen, I waited for awhile, and then the phone reset with some message from the RUU saying this cannot be used with your phone (something like that, dont quote me). So I tried again a few times knowing that win7 would not have to re-download the driver, but I had the same results, phone resets, error message from RUU.
If anyone has a fix It would be much appreciated.