i have regular problem with my dell laptop studio 1555 dvd rom .when i bought it two months ago it doesnt accepting the dvds or cds and now it reads only cds and vcds but not the dvds whats the problem i dont know
A Google search indicates that "Code 28" means the driver for the device isn't installed.
Go to Dell's Support website (http://support.dell.com) and enter your Service Tag (found on the bottom of your laptop). While you're there, make sure all of your drivers are up-to-date.
If the problem persists, contact Dell - I suggest the web chat because I've heard horror stories with the phone chat - and ask them to help you. If it's a known problem, they should be able to replace the drive for you. I'm not sure if they'd charge you though, because I had the CompleteCare warranty and got lots of free replacement parts. ^_^