Another user posted this fix. See if it works for you -
- change your resolution to 800 x 600 (start>setting >system resolution. once it's been changed, your screen size will look very big. REMEMBER your initial resolution setting!
- launch TT and the activation screen should launch. copy / paste in your activation code. you should get the 'all set' green check mark
- change your resolution back to what is was originally.