OS crashed and cant install windows 7. fails during expanding windows

How to use Dell Recovery Partition,make Recovery Disks & how to order Recovery Disks.
Dell - Support


As you install AVG, you may find the Recovery Partition unusable.

No one here recommends AVG since it became a bloated mess some years back. Use free Microsoft Security Essentials or Avast 6 for best performance.

Try booting into Safe Mode with Neworking to install, update and run a full scan with Malwarebytes.

Boot into System Recovery Options to run Startup Repair - Run 3 Separate Times to see if it finds an installation to repair, then what it reports.

Startup Repair should automate System Restore, but if it fails try running it manually from the Recovery Options list.

Next open a Recovery Options Command Prompt to run SFC -SCANNOW Run in Command Prompt at Boot.

If all fails, you can copy out your files using this method: Copy & Paste - in Windows Recovery Console

Then run Full Factory Recovery from partition or disks if you have/made them, or use a Win7 installer to clean reinstall with Product Key on COA sticker following these steps to get a perfect OEM clean reinstall: Reinstalling Windows 7

hi I have had this problem and found it to be a faulty stick of ram

check your ram guys

After 5 years why is it that windows 7 is still getting stuck and then fails to install altogether while expanding windows files? There are no issued messages, no error codes not even a suggestion of what went wrong other than "Install Windows : Windows cannot install required files. The files may be corrupt or missing. Make sure all files required for installation are available and restart the installation. Error Code 0x80070570. Any changes that were made to your computer during the installation process will not be saved." There are No log files saved. It just rolls over and falls on its back and dies. How are users supposed to know what to do? It seems as though ram disk space was under allocated. As can be seen on many postings when users temporarily remove ram the install will proceed. Perhaps removing ram is causing the ram disc allocation to be expanded. During the install users have no control over what file are available in the iso downloads from mstf.digitalrivercontent.net. Can someone at Microsoft please fix the problem with the iso installers Windows 7 Home Premium 64Bit: http://msft.digitalrivercontent.net/win/X17-58997.iso
SHA1 Hash value: 6C9058389C1E2E5122B7C933275F963EDF1C07B9
and
Windows 7 Ultimate 64Bit: http://msft.digitalrivercontent.net/win/X17-59465.iso
SHA1 Hash value: 36AE90DEFBAD9D9539E649B193AE573B77A71C83?
Do the customers really have to do all of the product testing?

Work through these steps for Overcoming Windows 7 Installation Failures - Windows 7 Help Forums.

Use a fresh ISO with the tool provided to write to DVD. If that fails after you've tried all the steps then change to Flash stick install.

The error normally means a bad installer so all install methods should be attempted. I would also test my hardware from Troubleshooting Steps for Windows 7