qt-creator ide have blurry fonts in windows7

i'm starting study in QT on windows 7. but i had trouble on qt-creator 4.8.0.when i finished install qt-creator-4.8.0,i found some font is blurry. you can see it the image below:

as you can see ,some fonts is blurry.how can i fix it? with it create some app,the fonts also is blurry.

but on other computer,it works fine.

Can anybody tell me how to fix it?