BD-ROM DRIVE [hp bddvdrw ct21l ata] "HP Pavilion DV4i-2100 Entertainment PC" wont read DVD

[Wrosun]

I have a HP Pavilon dv4i-2100 notebook.Product VP018AV.I formatted my loptop and changer the OS to Windows 7 ultimate from Windows 7 Home premium.

i have got a probelm with my bd rom drive.

i had this problem before also but it some how got remove it self....
the problem is that the optical device won't read DVD-r but reads Blu-ray disk and CD .

Since it has got different lens for BD and a combinational one for CD/DVD i am sure that there is no problem with the lens.
And its not that it does not read dvd at all it shows all dvd as blank.So it recognises that its a dvd but does not open the data. 

I think that the problem got removed previously by deleting the upper and lower filters in the registry.
I formated my laptop and now i am having the same problem again.
This time i tried the same solution but i end up getting the following error. 

when i go to device manager here is what i see.When i double click hp bddvdrw ct21l it opens its property and go to details it shows CD-ROM Drive.Now i dont know if its suppose to show that or not.

but what i suspect is that the driver for it is not correct and when i uninstall it and re-install using the device manager same driver gets installed automatically.

and when i check the driver detail it shows 

i also opened the file location and tried to delete the driver CDROM.SYS  but  it shows following error

so i cannot delete also.i was thinking if i could delete it then windows update would automatically find me a new driver but it wasn't so.i treis the solutions to delete system files using command prompt by assigning ownership but it says ACESS DENIED.so there is no way i can delete it...
I tries looking for the drivers myself but no luck with that also.
i want some expert advice or some one having  HP Pavilion DV4i-2100  notebook could go on and check in their device manager and check the driver details for [hp bddvdrw ct21l] and just tell me if what i see is normal because i suspect the probelm i am having is due to driver problems....if any body got a different driver the please share with if and i would try to replace it to the one i currently have...fingers crossed hope this will get removed replacing the driver...thanks in advance

[Raulnica]

Hi, i have a HP PavilionDV7-3165dx, same problem, BDRW ROM is not working, but in my situation i found a conflict in the device manager, so when i tried to see the drivers info i found two drivers GEARAspiWDM.sys and cdrom.sys, i moved the first to other folder but when i tried to move the second one, i found the same message, "you require permission to a trusted installer". so i think it is normal in this kind of file or we have some virus infecting the system. I´m going to try to fix the problem, if i find any way to solve it, i´ll write again here. Good Luck if you haven´t fixed your system.