Hi everyone, I have just put in practice the suggestion Fety gave me, that was installing a new firmware, for this I have done the following:
First I opened the Control Panel of windows, Performance and Maintenance, System, Harware, Device Manager, DVD CD Rom drives and checked the DVD Rom type, that was an SSM-85155S produced by Liteon. Them I started searching on Internet how to update the firmware, and I found the answer at http://forum.rpc1.org/viewtopic.php?...r=asc&&start=0
where I found the links to download the LtnRPC to make the DVD RW region free to play and write and also ready to accept the Firmware from Liteon as the DVD RW is blocked by Acer in order that you can not upgrade the firmware --> http://dhc014.rpc1.org/LtnRPC/
Then I went to http://www.liteonit.eu/index.php?opt...per&Itemid=178
to download the newest firmware, after that I went to http://digi.rpc1.org
to download the program to install the firmware, but it is only going to work with the file upx.exe that you can download at the same site. You can find the instructions there to use the program. Now everything is working fine.