Windows – Can’t connect to any wireless network

Today I connected to my friend's wifi and tried to troubleshooting my old problem

Low ram in windows 8.1 update

For the last trick I went for bios update and hdd regenerator. I have vostro 3300 and update it to a10 and a12 from dell.com and my product number and nothing's wrong I even restart 2 or 3 times and everything was fine.

After I came home I try to connect to my home wifi and windows 8.1 updated says that (cannot connect to the network).

I almost try everything like

1. driver update or downgrade
2. windows repair
3. normal nod32 scan
4. switch to local account
5. uninstalling hdd regenerator, dell wifi controller, some other programs
6. uninstall and reinstall wifi driver
7. disabling Bluetooth driver
8. disabling virtual box network adapter and remove it from wifi
9. test in safe mode
10. and know I'm scanning under safe mode with nod 32 (eset)

Suggest me what to do.

UPDATE

I can see the wifi's but it has low rate of refresh.

I can put wifi pass and windows try to connect but it ends on authentication.

I put the correct password and I'm 100% sure.

I test it with my phone wifi it cannot connect to my phone wifi either so it's not my modem

exact errors:

• most of the time after I put password it says verifying and connecting and then says can't connect to this network
• sometimes it shows connecting and even connected and wifi signal is full (it is half always) and then it disconnects
• after try to reconnect again it shows checking network requirements and then show can't connect to this network

I try to forget it and doing the same things showing the same result.