I managed to solve this problem, but its method is dangerous. If you wanna really solve the same problem, follow these steps at own your risk.
Caution:The method is dangerous and your secret information may be stolen. You should be careful.
1.Install old version of Avast Free Antivirus(it doesn't exist on the website of Avast)
2.Update it.
It's easy, but dangerous. When I installed old version, windows OS crashed. It displayed blue screen(I could recover.)
I hope I can be of any help to you.