I have an acer aspire laptop and I have disabled the speakers somehow and I can't find how to enable them again.I've been into the control panel and gone to sounds and the realtec symbol for the speakers is no longer there.I'm wondering if anyone can tell me how to get them back.I have no sound at all now

Do you still have the sound card driver? It's possible that this has been deleted.

1.check if there is an application make the sound mute.
2.reinstall the driver

Yes is still there.