i have deleted my sound by accident,i am trying to find howto restore them

Each time you use the partition where are the deleted files, you reduce your ability to get these files back.

If you can, unmount the partition (must not contain "/", home is managable is you log as root).
If you can't and you have a second disk, boot on a live CD and copy partition where files where deleted on second disk.
So you could work on this copy.
There exists software on Linux to try to recover deleted files.
How do you have deleted these files (rm?) ?

 go to the system - admin. - package manager open it click search type in alsa sound then search and it will bring up a list the ones with the ubuntu emblem`s with green boxes are the ones you need there is about 9 of them ..

the synaptic package manager is above the update manager.....

ok,i did that,when the list comes up i scroll down it and there is 9 of them with the ubuntu emblem with green boxes,there is also 7 more on the list with ubuntu emblem,that do not have green,do i did to click on those as well?

just try the ones with green boxes first ...

just read your second email .. go to update manager click check button and get updates.. if you need a restore program there is one in the software center ..... myself if i mess up my install i just re install no big deal i have done 6 or 7 times with ubuntu 9.10