I deleted it!!!

Yesterday ~
while looking through the programs installed in my laptop and trying to figure out which are the rarely-used-ones or I-can-do-without-ones....
... my "gatal" hands "accidentally" pressed the wrong button and deleted SoundMax - the sound device!!!

Alamak!!! (>口＜-)

Although I reacted promptly and immediately clicked on the "cancel" button....
it was too late and the files were all gone!!!

It simply means...
☆ window media player can't play properly
★ I can't watch vcd/dvd with the laptop
☆ I can't listen to music that I've downloaded
★ I can't listen to music online

Since I'm dumb in computer, I have no idea how to restore it.... (>_<。)

Anybody can help??? Orz
Any expert please help!!!