Pc games cannot operates on my laptop acer extensa 4620.please give me solution.The error like unable to access direct 3d drives has been occured.

You can only do it with a bluetooth dongle, it won't work otherwise.

1. i thing your dvd tray is not working properly.first you do onething take needle and put inside the tray and again put a oscd into the dvd drive and perform the reinstal the os.
this solution is not working suspected issue with dvd tray.

are you using the original software, if so, try switching the bluetooth off or on before installing the software

this is a memory error.
Google " pfn_list_corrupt " and there is lots of advice there, but it looks like your new memory is faulty/not compatable

You can check the Direct X by the following steps:
click Start> Run> Tyrp dxdiag and hit enter. It will give all the information about the direct X and settings.

i have acer Extensa 5210 but the laptop is working properly but the dvd drive is not working

Below is a link to the Acer driver page for your machine. Select the Operating System and type driver you need, download, and install. Best of luck!

Acer 4620 Drivers

Hi,
Call Acer Tech support these guys will verify some details and might give the master password to unlock the drive,

Further Queries are welcome
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plz check the drivers in the manufacture website