Sorry it took me acouple days to get back with you but this darn heatwave caused a power outage and my wife has my laptop at work with her.
Anyway, go ahead and delete that value.
You have more then a simple upper and lower filters value issue here however.
Also, the missing context menu has nothing to do with those reg values.
Your going to need to do some software cleanup and re-installs as well for starters.
Start with the following steps in order:
1. Delete that reg value.
2. Download and run the Nero 7 Clean Tool
to remove any leftovers the uninstall may have left behind.
3. Do the "Full" uninstall of Winamp described here
(not the "quick and dirty").
4. Remove your cd drive from device manager then reboot to let windows re-detect it again.
5. Reinstall Winamp if that is your only burning software.
If you have any other burning software, remove it as well before
It's not a good idea to install multiple burning programs and Winamp is very limited.
Afterwards, if your still missing the right click > send to option, that's an easy fix.
Let us know.