Sorry to hear you haven't been able to fix your problems in more then one month... :sad:
Make sure you use a 80 conductor IDE cable for your opticals. Some motherboards just don't enable DMA mode without it.
More, you seem to have a software problem. Maybe on time to reformat and make a fresh install of OS and your other apps.
Please post an output from Nero InfoTool.
"Click the diskette button at the top of InfoTool to save the report to a text file, and then copy-and-paste the report into your post, enclosed within [ CODE ][ /CODE ] tags."