Hello Rasler,

Thank you for posting in Microsoft Community.

We understand that the computer is lagging and freezing. We also understand that you have done a lot of troubleshooting steps including Hard reset your computer, and we appreciate your efforts to resolve the issue. Now, as the issue still persists, please follow the below steps to troubleshoot and check if the issue persists.

Step 1: Microsoft Safety Scanner.

The Microsoft Safety Scanner is a free downloadable security tool that provides on-demand scanning and helps remove viruses, spyware, and other malicious software. It works with your existing antivirus software. Please refer the below link to download and run the Microsoft Safety Scanner.

http://www.microsoft.com/security/scanner/en-us/default.aspx

DISCLAIMER: The Microsoft Safety Scanner expires 10 days after being downloaded. To rerun a scan with the latest anti-malware definitions, download and run the Microsoft Safety Scanner again.

The Microsoft Safety Scanner is not a replacement for using an antivirus software program that provides ongoing protection.

Now, if the issue persists, please follow the below step.

Step 2: Clean boot.

Putting your system inClean Boot state helps in identifying if any third party applications or startup items are causing the issue. You need to follow the steps from the article mentioned below to perform a Clean Boot.

https://support.microsoft.com/en-us/kb/929135

DISCLAIMER: After troubleshooting, refer to this section "How to reset the computer to start normally after clean boot troubleshooting".

Now, if the issue persists, please follow the below step.

Step 3: SFC scan.

System File Checker is a utility in Windows that allows users to scan for corruptions in Windows system files and restore corrupted files.

Follow the below steps to perform an SFC scan.

1. Press Windows key + X key.

2. Select command prompt (admin).

3. Type the below command:

Sfc /scannow

Please let us know if the issue is resolved or you need any further assistance.