[BigDASH]

It may be the mobility center...

You may have to disable that in order to let the PC talk directly to the device. Go to the task manager and kill the process. Rinse ... Repeat...

The whole process should take less then 15 minutes.

Another thing maybe you have selected too many things when cooking up your ROM try a real basic ROM first. If it works you know you have too many things chosen and need to cut back. Plus you will then know how to do the flashing...