Windows 7: black screen after log in

Hi.i have hp pavilion dv6 notebook.its been less than a month that i have installed my Windows 7 64 bit Ultimate. Now the problem i face is like this. Everything shows up fine until the welcome screen after that it normally used to fade to the desktop but now it goes blank. The screen in Black with only the mouse pointer. Its not hung, i can move the mouse pointer. Then after a minute or so it advances to the desktop. Everything on the desktop loads up in less than 5s. The PC runs fine, it is really fast as there are only a few programs, but only boots slow. My total boot time is about 3-5 min. I think it should be like in a minute or so.
I already minimized the programs in the msconfig>startup to the minimum. I have run ccleaner, spybot s&d, mse. there are no peripherals attached during boot except the USB keyboard and mouse. A printer is attached too but is most of the time turned off.

I don't know what is causing this problem


here is the boot log as attached