installing Windows 7 on dell xps 15 l521x

Hi Footface,

Welcome to Dell Community Forum.

We understand you would like to downgrade from Windows 8 to Windows 7. Please click on the link below for a Dell article which discusses the critical steps that you should take before and after downgrading to Windows 7 Professional on a factory-installed Windows 8 Pro computer, such as creating recovery media for Windows 8 Pro, downloading appropriate drivers in advance, and changing system properties. The article also lists the systems on which the downgrade is possible.

http://dell.to/11wZYxW

Please note that the instructions provided in this document are specifically provided for customers who have purchased computers pre-installed with Windows 8 Pro who wish to downgrade their operating system to Windows 7 Professional. Microsoft does not provide a downgrade path for customers with other versions of Windows 8, and Dell may not provide legacy driver support for Windows 7 Professional on computers factory-shipped with Windows 8 Pro.

I hope you find the information contained in this article helpful. Let me know if further help is needed.

Thanks and regards,
Babita S
#iworkforDell 

For easy access to drivers, manuals and product updates, please visit our Support Site .

I have downloaded from MSDNAA pl_windows_7_professional_with_sp1_x64_dvd_u_676944.iso

is it the newest version?

i have an 0x80070570 error during install ... ;(

ok i've downloaded Again. install ok.

but i want to use UEFI ... how to do this?

Hi Footface,

Thank you for your reply.

Error 0x80070570 is indicative of a file or directory being corrupted and unreadable. As requested earlier, please go through the information provided in the link below. The article discusses the critical steps that you should take before and after downgrading to Windows 7 Professional on a factory-installed Windows 8 Pro computer, such as creating recovery media for Windows 8 Pro, downloading appropriate drivers in advance, and changing system properties.

http://dell.to/11wZYxW

This link contains the following steps including the UEFI information you would like to access :

1. Disclaimer
2. Before You Begin
3. Create Windows 8 Recovery Media
4. Download Critical Drivers to a USB Key
5. Disable Secure Boot in the Dell BIOS
6. Install Windows 7
7. Update Critical Drivers from USB Drive
8. Update All Drivers from Dell Support Website

Please go through the complete information in the link provided above, prior to beginning the downgrade installation. The article has exhaustive information and complete steps for successfully downgrading to Windows 7 Professional. 

Additionally, the screenshots provided in the link below  will help you with steps for doing a clean installation of Windows after cleaning both the SATA and mSATA hard drives using diskpart. This is a crucial step and if you skip this, you may not be able to install Windows correctly.

http://dell.to/12mMfyI

Let me know if further help is needed.

Thanks and regards,
Babita S
#iworkforDell 

For easy access to drivers, manuals and product updates, please visit our Support Site 

See also Windows Reinstallation Guide/A Clean Install of Windows 7:

http://philipyip.wordpress.com/dell-community-forums/

OK, i installed Windows 7 x64 without any problems! ;)

and now i have UEFI boot on it! and IRST with 32GB mSATA SSD.

everything works great and really, really ! fast.

if Question I can help.

Hi Footface,

Thank you for your reply.

We are delighted to learn that you have completed the installation without any problems and everything is working great.

 If you need further assistance with your Dell in future, please feel free to contact us. We would be happy to help.

Thanks and regards,
Babita S
#iworkforDell 

For easy access to drivers, manuals and product updates, please visit our Support Site .

Hi Footface,

I have the problem and I hope you can help me to be happy as you.

Thx

DELL XPS L502X

After logging to computer i am getting an error RUNDLL32 has been corrupted kindly please assit

Hi Kkrishna,

I apologise for the delay in responding to your post.

Click on the link below to prevent RunDll errors from occurring.

http://dell.to/15guJyR

You may also find this Microsoft link for fixing RunDll errors at startup helpful: http://dell.to/14DhDcC

In case the issue persists, please let us know the complete error message you see on startup alongwith the operating system you are using so that we are able to assist you further.

Thanks and regards,
Babita S
#iworkforDell 

For easy access to drivers, manuals and product updates, please visit our Support Site .