I have an Acer and since upgrading to Windows 7, the DVD drive is only there intermittently. If I start the computer and go to 'Computer', the drive will be there. I double click and it will say 'Please insert a disc'.....no problem. If I start the computer and put a disc straight in, nothing will happen. Double clicking the DVD drive results in 'you dont have permission to format this drive' error displayed. Then the DVD drive icon will disappear. I've tried the fixes as per microsoft like altering the upper filters (reg entry not there) and also stopping the power management software via cmd prompt. I'm out of ideas so wondered if anyone else had and suggestions for me. Thanks in advance everyone........ PS I know there is a separate thread similar but it is for a specific model laptop.