Extreme left on first screen obscured after sign-in. Windows Live seems to override Hotmail info. Can’t use account.

I can sign in. I can barely find "Options" on right, but can then log out. PROBLEM: I can't read, delete or send emails on my own computer. On my husband's computer re my account he can use the account normally: nothing is obscured on screen. I can use it if I switch to IE from Mozilla Firefox (my default browser). I de-installed Firefox and reinstalled it. Same problem. Many reoccurrences since last night.