Hi guys, I have a pentium D 3.4 ghz proccy with 512 mb ddr2 400 mhz ram on an asus mobo and a dvd writer. Oflate i have been experiencing two problems with it. 1)Whenever i try to write a cd or dvd using nero, the cd/dvd becomes useless. Although nero shows that it has been written successfully, but when i run it, it shows that it is still empty. And then when i try to write it again, it tells me to insert a blank cd/dvd and the cd/dvd becomes useless. 2)whenever i try to change the programs, that run on booting the comp, through msconfig, it shows me the following error, "An access denied error was returned while attempting to change a service. You may need to log on as using an administrator account to make the specified changes." But actually i have only one account on this system which is an administrator. Oh BTW the only recent change that i had made on this comp was installing mcafee anti virus. So pls help me in figuring out this prob. thnx in advance.