The only way I know is sharing the drive on every PC but that requires always a password as far as I know. However there may be a way to share without a password:
Open the control panel and navigate to [Network and Sharing Center], then click on {Change advanced Sharing settings].
Here you need to click on [All networks] and navigate to [Password protected sharing] and tick " turn off ".
this may be what you want to have but remember that you have to do it on ALL your computers...