Windows 7: Black Screen before Login

Hello,

I bought a Acer Aspire 7540 for a few weeks ago, OS: Windows 7. Windows 7 was already installed, I only had to configurate Windows 7. So, I don't have a Windows 7 Install CD or something. Only a Repair Partition and a Backup partition.

I used McAffee Security Center for trail version for 60 days and this morning a McAffee popup showed me that my trail period was over, I had to buy a license to be secured for the next year. I didn't want to pay money and I uninstalled McAffee Security Center. That's was not smart...

Because Windows 7 doesn't work anymore. I get a black screen instead of the login screen. The mousepointer is the only one that I see I searched around for an answer but I couldn't find a answer that worked out. Reboot and run in Safety Mode gives the same problem.



I read this on a Forum, I think that is the problem:

"A common cause of this problem is malware which modifies the "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell" registry key to load itself at startup. This key should be a string value of "explorer.exe"."

My keyboard en mouse are working fine.

Things that I've tried:
-Ctrl + Alt + Delete: nothing happen
-Ctrl + Shift + Esc: nothing happen
-pressed 5 times Shift: A popup about sticky keys appears with 2 options, Yes or No

Someone gave this solution for the same Windows Vista problem:

"When you press the shift key 5 times and you hear the noise, do you get a popup asking if you want to turn sticky keys on? If you do, click the link in the center that says "go to the ease of access center to disable the keyboard shortcut". This will open a new window. In this window, you can type c: into the address bar and you will get an Explorer window. Navigate to c:\windows\ and launch explorer.exe. Now do a virus cleanup"

I think that I can solve this problem when I've acces to a window so I can navigate. But how do I reach such Window?

Can you help me?

Thanks

sorry can you be a bit more specific there, your post is very informative but i am a little confused about the title and the problem you are having,

are you getting a black screen and then the windows login, or are you getting a black screen instead of the windows login?

Sorry, I get a black screen instead the login screen

ok, well i am assuming you have access to another PC as you are posting on here, so what i would recommend is downloading a repair disk iso from here: Download Windows 7 System Recovery Discs — The NeoSmart Files and then burning it, boot from that disk, and click "repair my computer" then run a system restore

Hello....

i'm having the same problem blackscreen before window login.the window logo come out but after that no login ... display appear.then i hit the sleep button to make the window in sleep mode. after that i hit the button again to wake up the window, then the window login come out.please help me, i dont know how to resolve this. i'm using computer: hp dv3000, processor intel t5750, ram ddr2 3gb, gpu: nvidia geforce 8400M GS of 256 video memory. this problem doesnt happen when i'm use window vista in the past.TQ

This problem is caused by malware. It sometimes shutsdown your computer too.
I got rid of the malware with malwarebytes' anti-malware. i restarted my computer and it starts up fine.