Windows 7 svchost.exe + NTDLL.DLL Causing high CPU Usage

Troubleshooting Steps:​

1. Update Windows: Ensure that your Windows 7 system is up to date with all the latest updates and patches. Sometimes, Microsoft releases updates to fix such performance-related issues.
2. Scan for Malware: Run a full system scan using your installed antivirus software to check for any malware or viruses that might be causing the spike in CPU usage.
3. Check for Faulty Hardware: Since you mentioned the issue occurs after a few hours of the computer being on, it's possible that there could be a hardware issue causing this. Check for any overheating problems or hardware malfunctions.
4. Check for Driver Issues: Make sure that all your drivers, especially for the motherboard, graphics card, and sound card, are up to date. Outdated drivers can sometimes cause such issues.
5. Disable Windows Services: You can try disabling unnecessary Windows services one by one to see if any particular service is causing the spike in CPU usage.
6. Resource Monitor: Use the built-in Resource Monitor tool in Windows to get more detailed information on what exactly is causing the spike in CPU.
7. System File Checker (SFC) Scan: Run an SFC scan to check for and repair any corrupted system files that might be causing the issue.
   

   Additional Information:​

   • TID 752: Thread ID 752 could be related to a specific process or service running under svchost. Identifying the service associated with this thread could provide more insight into the issue.
   • ntdll.dll: The ntdll.dll file is a crucial component of the Windows operating system. If there are issues with this file, it can lead to various system problems. Running diagnostic tools like the Windows Memory Diagnostic can help identify potential memory issues. If the issue persists after trying these steps, it might require more in-depth troubleshooting or the assistance of a professional technician. Feel free to provide more details if needed for further assistance.