I have started threads for my problem in this forums. Thanks to you guys, all problems have fixed. But I am involved a big problem which is not easy to fix. I have tried many ways to fix, but still same. So I am here hoping you guys here would help me out.

The problem:

Whenever I boot up my PC and login to my account, it shows me a black screen. Shortly after that, a cursor appears. However, I cannot right click with the cursor. Furthermore, pressing ctrl+alt+del does not pull up the task manager.

What I have tried:

I have tried booting into safe mode like other said, and I don't have the problem there.

Repair and system diagnostics did not detect any problem.

Maybe it gots virus? I scan by antivirus software, same problem.

Reinstall? Thanks.