Help my comp is dieing!

OK I have a problem with my PC for some reason the sound has disappered and it cannot pick up either my USB headset or speakers…

Also everytime it loads it says the system registery has been recovered about 10 times… then it trys to open a file called cli.exe…

IM currently scanning with norton and have scanned with adaware, S&D and CCcleaner… It also wont let me enable auto protect on my norton !

yeh so any help would be appreciated!!