Windows 10: I don't know my email and how do I fix some problems? urgent help please

First of all, this is not my account but my brother's account. I used to know the e-mail of my account and I was using it properly but one day the e-mail of my microsoft account changed and then I tried to change it again but it didn't work and I don't remember that changed e-mail but I remember the e-mail I used to use. The things I know about my account are: my old e-mail address, my card information that I used to buy I don't remember exactly, and I remember the beginning of that e-mail that was changed, “gla............com” I think it was something like that and I also had an xbox accoun

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i can,t receive any email from my mail apps

hi!!

i can,t receive any email from my apps

i don,t know how to fix this problem

can you give me the steps?

thank you

OP - outlook

 

WarRock 3D Detection don´t works

Hello Guys,

i had a problem with my Card. The card didn´t wanted to change in 3D Modus. Ok now i removed the other 2 Pins and now it runs in 3D Modus in 3DMark06 too. The Card is a HD 2900GT. But my Game WarRock don´t runs in 3D Modus. Is there a List where i can start the game in 3D Manual? Because in Automatic it don´t want start because the Card don´t see that it is an 3D Game. Can someone help me?

 

I don´t get any emails from the marketplace so can´t buy or reinstall apps

I don´t get any emails from the marketplace. The email address is working fine, I tried an alternate, didn´t work either. I don´t receive the email on my desktop nor on my Windows phone and it used to work fine. Can´t buy any app now!
According to my account I have installed the app many times, but there is no email to be found anywhere. Checked all trash folders etc to no avail. Both addresses I tried were Gmail addresses. The first one is my original Windows Live ID email address.
The phone (and my desktop) do receive other emails to these same accounts so apparently Windows Marketplace is not really sending them.
Problem continues for two days now.