You probably uninstalled the drivers for your sound card.
If you know the soundcard model you can download the drivers from the internet or use the drivers CD you got with the computer.
You can also use system restore to restore the computer to date when it was working.
To use System Restore to restore Windows XP to a previous state, follow
- Log on to Windows as Administrator.
- Click Start, point to All
Programs, point to Accessories,
point to System Tools, and then click System Restore. System Restore starts.
the Welcome to System Restore page,
click Restore my computer to an earlier time
(if it is not already selected), and then click Next.
the Select a Restore Point page, click
the most recent system restore point in the On
this list, click a restore point list, and then click Next.
Note A System Restore
message may appear that lists configuration changes that System Restore
will make. Click OK.
- On the Confirm Restore Point Selection page, click Next. System Restore restores the previous
Windows XP configuration, and then restarts the computer.
- Log on
to the computer as Administrator. The System Restore Restoration Complete page is displayed.
If you successfully
restored your computer to a previous state, and the computer is
performing as it should be, you are finished.