Black screen upon start up

Hello, I have a frustrating problem ever since I did windows critical update and changed anti virus and this problem occurred yesterday. Every time I reboot my PC, a black screen appears with a cursor shows up for a few minutes before going onto login screen/welcome screen. I did system restore back to a month and it still doesn't work. I uninstalled anti virus to see if that might be the case and the black screen is still there. I then reformatted my pc by reinstalling windows 7 again using the disc and the problem is still there. My pc is only one year old as well and it's quite fast and quiet. Normally when I startup my PC it goes straight onto the welcome screen/desktop without this black screen. What can I do in this case? Much help will be appreciated.

ThrashZone said:

Black screen after login, cruiser still works,
http://social.technet.microsoft.com/Forums/en-US/w7itproperf/thread/d47aece7-5e12-46ec-8d3e-e8671730a7ce

I have tried all of that and none seems to work. However my issue is that the black screen appears for a few minutes after the windows logo appeared but is able to boot onto my login/desktop afterwards.

When booting, hit F8 and choose Safe Mode. If that then lets you log in, rollback any updates you installed.

CBlunt said:

When booting, hit F8 and choose Safe Mode. If that then lets you log in, rollback any updates you installed.

It still remains the same even with Safe Mode. It was still like this when I used the windows 7 retail DVD to reinstall windows again so I am not sure what's causing it.