my shields are off so im trying to sign in to show i got a account but it gives a internal error of some sort
Some appear to have problems signing/logging in when using the avastUI, this is generally a server issue. I don't know why this is as it doesn't effect everyone.
It doesn't effect me, however I generally login to my.avast.com account (which I presume is what you are trying to do?) using my browser. This is mainly because I prefer the larger layout to that when displayed in the avastUI. Having signed in, I don't sign out, so I'm normally recognised next time round.