Cannot log in group policy client service failed

How can I get access to machine administrator account?

If your Windows was installed by Dell you must contact Dell

If not Microsoft gives this solution:

1.Install Windows Automated Installation Kit (AIK) for Windows 7 on the computer. To download Windows AIK, go to the following Microsoft website:
http://www.microsoft.com/en-us/download/details.aspx?id=5753
(http://www.microsoft.com/en-us/download/details.aspx?id=5753
2.Create the Windows RE image (Winre.wim). To do this, follow these steps:
a.Click Start, click All Programs, and then click Windows AIK.
b.Right-click Deployment Tools Command Prompt, and then click Run as administrator.
c.Copy the Install.wim file from Windows 7 installation media to a folder. To do this, run the following commands:
md C:\OS_Image
md C:\OS_Image\mount
copy D:\sources\install.wim C:\OS_Image
d.Mount the Install.wim file by using the ImageX tool. To do this, run the following command:
ImageX /mountrw C:\OS_Image\install.wim 1 C:\OS_Image\mount
e.Copy the Windows RE image (Winre.wim) from the mounted Windows 7 image to a folder. To do this, run the following commands:
md C:\winre
md C:\winre\mount
copy C:\OS_image\mount\windows\system32\recovery\winre.wim
C:\winre\
f.Unmount the mounted Windows 7 image after you copy the Windows RE image (Winre.wim). To do this, run the following command:
ImageX /unmount C:\OS_Image\mount
3.Install the hotfix on the Windows RE image (Winre.wim). To do this, follow these steps:
a.Mount the Winre.wim file that you created in step 2. To do this, run the following command:
ImageX /mountrw C:\winre\winre.wim 1 C:\winre\mount
b.Install the hotfix on the mounted Windows RE image. To do this, run the following command:
Dism /image:C:\winre\mount /Add-Package:c:\TEMP\Windows6.1-KB2709289-x64.msu
c.Determine whether the hotfix is installed successfully. To do this, run the following command:
Dism /image:C:\winre\mount /Get-Packages
d.Commit the changes to the Winre.wim file. To do this, run the following command:
ImageX.exe /unmount /commit C:\winre\mount
4.Create a customized Windows RE medium by using the Winre.wim file. To do this, follow these steps:
a.Create a file to make a Windows RE image. To do this, run the following command:
copype.cmd amd64 C:\WinREx64
b.Copy the Winre.wim file to the ISO\sources folder, and then rename the file as Boot.wim. To do this, run the following command:
copy C:\winre\winre.wim C:\WinREx64\ISO\sources\boot.wim
c.Deploy the customized Windows RE image to any media.

Thanx but I cannot log in with any user and administrator account. So,how can I access the start butten then. Is there any types of files that I can copy into system using other bootable CD's and there it works?

My default administrator account is also disabled.

If your Windows was installed by Dell you must contact Dell