When I try to burn a c.d. it will only burn about 9-11% of the data. I've used the program for awhile and have not had any problems until now.
I've tried a system restore to no avail, and I cannot find my installation disk
to try to re-install nero. Please help.

Try the Nero Info Tool.

Just download the programme again M8 and re-install it

Ahead Downloads (http://www.nero.com/en/631934351031098.php)