how do i restore all sound settings?

Hi,

Try System Restore back to a point before you did that :

How to Do a System Restore in Windows 7
http://www.sevenforums.com/tutorials/700-system-restore.html

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If needed :

Do these to clear corruption and repair/replace damaged/missing system files.

Start - type in Search box -  COMMAND   find at top of list -  RIGHT CLICK  -  RUN AS ADMIN

sfc /scannow

How to Repair Windows 7 System Files with System File Checker
http://www.sevenforums.com/tutorials/1538-sfc-scannow-command-system-file-checker.html

Then run checkdisk (chkdsk).

How to Run Disk Check in Windows 7
http://www.sevenforums.com/tutorials/433-disk-check.html

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After the above : (References to Vista also apply to Windows 7.)

Control Panel - Device Manager - SOUNDS - look for HD Audio - Mine says RealTek High
Definition Audio (that is an example and yours may have an entirely different name/maker).

Write down description make and model - double click on it - drivers tab - write down version.
Now Click UPdate Drivers which may not do anything as MS is far behind certifying drivers.
Then RIGHT CLICK on it and UNINSTALL - REBOOT - this will rebuild the driver stack.

1st go to system maker's site and look for latest driver Download - SAVE - go to right click on
and RUN AS ADMIN (This is your fallback.) REBOOT after each driver installation.

NOTE : Sound drivers often rollback so check the version after installation and the
reboot to see if the version you installed is there, if not repeat the install - reboot
until it is. It can take several tries depending on how many rollbacks it does.

Then do same for Device Maker's site.

Manually look at manufacturer's sites for drivers - and Device Maker's sites.
http://pcsupport.about.com/od/driverssupport/ht/driverdlmfgr.htm

Installing and updating drivers in Windows 7 (updating drivers manually using the methods above
is preferred to ensure the latest drivers from System maker and Device makers are found)
http://www.sevenforums.com/tutorials/43216-installing-updating-drivers-7-a.html

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Error “the Audio Service Is Not Running” When Opening the Volume Mixer in Vista
http://www.winhelponline.com/blog/error-the-audio-service-is-not-running-when-opening-the-volume-mixer-in-vista/

Also Right Click Speaker near clock - Playback Devices - right click in the box area -
check Show disable and disconnected devices. Highlight speaker and on the lower
Right click Properties check settings for Device Usage enabled and so on. Also do
same for Configure on Lower Left of that box.

In Control Panel you can also look for an Audio Manager along with the Sound Settings.

Open the Playing Audio troubleshooter
http://windows.microsoft.com/en-us/windows7/Open-the-Playing-Audio-troubleshooter

Problems with sound and audio or no sound - a Mr Fixit
http://support.microsoft.com/gp/no_sound

No sound in Windows
http://windows.microsoft.com/en-us/windows/help/no-sound-in-windows

Tips for fixing common sound problems
http://windows.microsoft.com/en-us/windows7/Tips-for-fixing-common-sound-problems

Speakers and other audio output devices
http://windowshelp.microsoft.com/Windows/en-US/Help/a43f3a31-6d9f-49d1-be22-e2f47b8b1f2c1033.mspx

How to Enable Hidden Audio Devices in Vista
http://www.vistax64.com/tutorials/143447-audio-device-enable-hidden-devices.html

How to troubleshoot sound problems that you experience after you install a Windows Vista
Service Pack
http://support.microsoft.com/kb/948481

Hope this helps.