Thanks for the replies.
I only have one hard drive in the computer.
It is a 300 GB Maxtor 7200 RPM with 93 GB of data on it.
I'm running Windows XP service pack 2 and the processor is a Intel Core 2 Duo 2.13 GHz.
I defragged it some over the last 4 1/2 years but was told years ago that you shouldn't defrag too much when you have valuable data on a hard drive. Don't know if that was good advice or not.
Other programs seem to be working fine. My projects use a lot of samples with MIDI sequencing. (VSTis)
The only audio tracks are guitar parts.
The problems really started after I drove 2000 miles with my computer in the trunk of my car.
I had been having some dropout problems before then but I assumed it was because I had too many tracks in my projects. The hard drive makes a little more noise than it used to but when I ran check disk it says there are no bad sectors. I can start a new project and everything seems to play all right so it's only my older projects that aren't playing. I cloned the hard drive to an SSD and still have the same problem so I doubt it's a mechanical issue.
I'm using an e-mu 1212M soundcard with whatever the latest drivers were about four and a half years ago.
I tried opening Sonar first and loading projects. I tried double clicking the projects and right clicking and selecting open, all with the same results.
It takes a long time for the projects to load. Sometimes they don't load at all so I do "control alt delete".
That's when I see two instances of Sonar in the task list that say Sonar 7 Producer Edition Not Responding. I don't' see SONARPDR.EXE on the task list. If the project loads all the way then there is only one instance in the task bar and it says Sonar 7 Producer Edition Running.
My question is do y'all think it would be a good idea to uninstall Sonar and reinstall it? I don't want to risk harming my project data.