If I try to restart in normal mode I get the blank screen just after the windows screen. If I run diagnostic, I get the blank screen in the middle of the memory check.
I get it after 5 or 10 minutes while in BIOS or in DOS.
Why do I need to reinstall Windows you, might ask. A month ago I got a rootkit virus. It infected the boot sector, plus multiple over thing. I removed the malwares and viruses and installed Kaspersky anti-virus trial. After a month I removed it to reinstall Norton which came with my internet service. When it was installed, the system froze at restart. It would be loading but nothing happened. I called Norton; they try to resolve the problem. The third guy seemed to know what he was doing, cleaned the computer. Reinstalled Norton, and it froze like before. He told me that the virus may have caused damaged to the operating system. It sounded like a good story so I believed it. I started the repair and that's when the troubles really started. Now I can even go in safe mode or recovery.
Someone started talking with me in chat and help me retreave my login name, but when I loged in it terminated the cchat and now I don't know where the chat is located on the site. I wanted to thank the guy who help me.