Computer does not boot up after changing the active cores from 2 to 4 cores using ms.config

Hi Lui. I'm Greg, an installation specialist and 9 year Windows MVP, here to help you.

That's not a setting to change. It's only for testing.

I will give you steps to access the Repair Mode to try all repairs to get Windows started, and if not to do the automated Reset or the superior Clean Install after rescuing your files. These steps don't cover possible hardware failure which might become apparent while performing the steps, so please report back as you go:

1. Use whichever method works in this link to access Advanced Startup Options: https://www.tenforums.com/tutorials/2294-advanc.... Easiest may be to force shut down the PC (by holding in the power button) three separate times to trigger the Startup Options.
2. If none of the other methods work it may be necessary to Create Windows 10 Installation Media on another PC: http://windows.microsoft.com/en-us/windows-10/m...

Insert media, boot it by powering up PC while pressing the BIOS Boot Menu Key: https://www.sysnative.com/forums/hardware-tutor...

Choose the boot device as a UEFI device if offered, then on second screen choose Repair Your Computer. If the media won't boot you may need to enter BIOS/UEFI Setup (pressing key given in chart in link above) to turn off Fast Boot or Fast Startup first.

3. In the Advanced Troubleshooting options try to System Restore to a point before the problem began, Startup Repair, then if necessary from Startup Settings try to get into Safe Mode with Networking, or lastly Safe Mode to revert the changes.

If Startup Settings aren't available you can force Safe Mode from Command Prompt following Step 5 here: https://www.digitalcitizen.life/4-ways-boot-saf..., or using the command to unhide F8 Advanced Boot Options here: https://www.tenforums.com/tutorials/22455-enabl... where you can also try the old reliable Last Known Good Configuration.

4. From Safe Mode w/Networking first try System Restore, then changing the msconfig setting back, if that fails work through the Windows 10 Install Integrity Checklist to make sure the install is set up correctly, optimized for best performance, and any needed repairs get donehttp://answers.microsoft.com/en-us/windows/wiki/windows_10-performance/windows-10-performance-and-install-integrity/75529fd4-fac7-4653-893a-dd8cd4b4db00: If it doesn’t fix Windows enough to start it normally, then try a Windows 10 Refresh: https://www.howtogeek.com/265054/how-to-easily-...

Update your drivers from the PC's Support Downloads web page. Compare the latest drivers with the ones presently installed in Device Manager reached by right clicking the Start Menu. Make sure you have the latest BIOS, Chipset, Display (Video), Sound, USB3, Bluetooth, Network and all other drivers, or else download and install the latest now.

5. If Safe Mode doesn’t work or help stabilize things then return to Advanced Troubleshoot options. Next try Command Prompt to run through Windows 10 Install Integrity Checklist (above link) repair commands including sfc /scannow, DISM, a full Disk Check, or return to Troubleshoot options to Reset Your Windows 10 PC.
6. Better yet do the vastly superior Clean Install Windows 10 following the steps in this link to delete all partitions down to Unallocated Space to get it cleanest: http://answers.microsoft.com/en-us/windows/wiki...
7. There is a step to Rescue Files from the booted media Command Prompt first: http://answers.microsoft.com/en-us/windows/wiki...

These steps are excerpted from my tutorial that compiles everything possible for Troubleshooting Windows 10 Failure to Start: http://answers.microsoft.com/en-us/windows/wiki.... You can continue with the other steps there.

I hope this helps. Feel free to ask back any questions and let us know how it goes. I will keep working with you until it's resolved.

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Standard Disclaimer There are links to a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.

Ok, i fixed it. Got a working computer with my 8 RAM and everything, theres on one problem. The disk space usage is always 100% highlighted in red. Is there anyway to fix it as i always close them down and they just come back.

SO I went into that application and  it says that 5000 MB (the ram I no longer cannot use) is being used for "System Reservations"How do I make it not do that?

Type Resource in Start search, open Resource Monitor, click on RAM tab. What does it show for how RAM is apportioned, as some will always go to hardware.

But if that doesn't resolve it Test your RAM overnight to stress it with a more reliable bootable test, following these steps which test both the sticks and the slots: http://www.sevenforums.com/tutorials/105647-ram...

Also run the Crucial Memory scanner to see how the installed RAM is configured and whether it's spec'd precisely. http://www.crucial.com/systemscanner/ This can reveal a mismatch, provide best quality RAM at decent prices to add or replace. Your RAM maker may also guarantee the RAM for life and help you test it for possible RMA.

Remove a RAM stick to check performance without it, then swap sticks.

I hope this helps.

Ok, so I got the computer working but for some reason only 2GB of ram is usable and this computer has 8GB RAM installed. Why is this?