Help! Please?

HI, just joined this wonderful forum. I am in need of some help…

I dont want to sound like a noob but I am. I have searched but have not gotten any firm solutions.

Here is my problem…

I am using Nero 6 and have been able to burn DVD+R about 7 of them and then DVD-R about 3 of them. All sucessful…For the past few days I have not been able to burn anything that will play on anything else other than the drive it was burnt on…

I have a P4 running at 1.8, 512mb, 160gb hd.
I have a Sony DDU1615 DVD-ROM
I have a NEC ND3550A burner
I am using Memorex DVD-R

I had flashed to 1Y6 firmware, thought that might be the problem, so I flashed back to OEM firmware, uninstalled both drives and both IDE channel. Rebooted the PC to let Windows XP (Home) reinstall everything. I can read from the Sony DVD-ROM. Everything looks like it works…

So again, everything I burn, does not play on anything else other than the NEC ND3550A drive it was burnt on…

Thanks in advance for your help…

Update Nero to 6.6.1.4.
Use better media than Memorex…