I have had similar problems with my current Nokia hp also...
it's a 7270 or something near there... forgot already and it's not
written on the phone... hahaha... My computer can read the data
cable once it's plugged in but I can only transfer data once, after
which i will see error messages... hahaha got to restart comp...
maybe it's the hp, but maybe it's the computer... or it's the
software...