My clerinet has been having a very annoying high pitch squeak in the high d and high e keys (also known as the low d and low a keys). I don't understand but the low notes come out perfically fine but when I add the register key, I get that squeak. I have been taking good care of the insterment and I have my embeshure set correctly, what els can I do?

I would take it to a music shop that does good repairs and have them check the condition of the pads and springs. You may not be getting a good seal on one or more keys. I don't play clarinet but have had this issue on other woodwind instruments - not necessariliy a high squeek, but general tone and clarity issues. The other thing they can do for you is watch careful as you play and see if you might be grazing another key inadvertently or otherwise doing something that could cause the tone problem.