What should I do if there is no sound after installing the sound card driver in Win8 system

1, press Win+R at the same time (the win button between ctrl and Alt), open the run window, enter "regedit" in the dialog box, enter the registry edit after the enter key 2; then click the "Edit" column, then click "Find". In the Find Target dialog box, type "Audiosrv" and remember to tick the whole word match at the bottom of the dialog box.
3. After the search is completed, find the RequiredPrivileges and right click on the RequiredPrivileges. Delete the last two items in the data, only keep SeChangeNotifyPrivilege;
4, then click OK.