Let's start simple. Take the side cover off and clean it out inside. Does it still do it?

Next we can try start, run or hit the Windows Key and the R Key at the same time. This will bring up the run command.

Type

CMD

hit enter

chkdsk /r     (Space between the k and /)

answer with a y

Restart your computer.

When the computer is finished, now what do you have?

Next simple thing is to

Insert the Windows Operating System Disk. Start, run or hit the Windows Key and the R Key at the same time. This will bring up the run command.

Type

CMD

hit enter

type

sfc /scannow     (space between the c and /)

This will check to make sure all the Windows system files are intact.

That's all the simple things to start with.

At startup screen press F8 and try entering using the safe mode. Try last good known configuration first. If that doesn't work, then try the safe mode and see if you can get in.

Did you add anything recently like new hardware? If so, power everything off, disconnect from wall and wait 30 seconds before you plug it back on. Sometimes people add memory and other items and don't disconnect the power. The computer doesn't look for any changes. When the power is completely removed, then the computer will look for changes on startup.

Do you have the Operating system disks?

I cannot use run unless I am not logged in. As I told in my message, after login the computer automaticaly is doing logoff, so I cannot use any combination of keys.

thanks, but this is what I'm trying not to do, the "re-instalation".

I know how to install and reinstall windows, it wasn't subject of this post.

Did you read the entire message? In my first message I told that the computer don't start even in safe mode.

Last good known configuration have the same reaction because, as I mentioned, I have a succesfull login and after this a logoff. I didn't install any new hardware. The computer condition is as delivered a few months ago.

Sorry I had a hard time when you pulled out the hard drive.

I would try a repair installation, if you have files on the hard drive, to try and save them.

Insert the installation disk and restart the computer. Press any key to boot from the CD.

Choose install.

Do the agreement.

Now choose repair.

It may take a little time but when it's finished, the computer will be at a Welcome screen. Hopefully you won't lose any files and folders.(I havent lost any on my Dell)

Remember to go to drivers and downloads and install the drivers in the following order.

Desktop System Software or Notebook System Software
Chipset or SMBus driver
Processor Driver (if applicable)
Video
Audio (sound)
Input Drivers (keyboard/mouse)
Modem
Network Card

Make sure you get all of the Windows updates again.

Have you tried logging on with different credentials? If works, just rename your profile folder located in system_drive:\documents and settings\ and log back on as yourself again.

if you don't have any other accounts in your system, just plug HDD into another PC and rename this folder. if helps, you can just copy your docs, desktop items, favourites etc into the new one.

I have the exact same problem (on welcome screen...clicking on a user...then . I tried reinstalll and the reinstall worked and no files were lost (I know it!). However the problem still exists....

Also I tried safe mode boot. It booted but the same problem still exists.

HELP!!!! anyone?

Clean install will take half a day including all extra software you might need. Trying to resolve this is already taking more time.

The choice is yours. :smileywink: