my computer screen resolution is 1680X1050. the screen size is 15.1’. windows 7 blue screen again today, and after that all application main GUI enlarged to 125% execpt IE and windows Expolorer. this is wired. Then i decided to log on to another user profile but found everything is ok. So what is different between this two profile? The answer is DPI.
by default, windows will detect the screen size and the resolution for logon user. as my case, it choose 125% as default. So i try to change it to 100% and logoff. after logon again, everything goes well as expected. then i choose to change it back to 125%. repeat logoff and logon. it works.
thanks the remind of Tang tianhao.