Hey everyone, I'm trying to diagnose a serious issue with my parents' old computer. Recently, it's been overheating and becoming completely unresponsive, even requiring me to shut it down by cutting the power. The system has been so slow that it can take over 10 seconds just to open Firefox, and starting the computer takes about a minute. When I checked the Task Manager, the CPU, memory, and disk usage are all over the place, with the disk often hitting 100%, especially during startup.
I've run several diagnostics, including memory tests, and I haven't found any errors. However, I did run 'Perfmon /report' and it alerted me that the average disk queue length is 15, suggesting the disk may be overloaded. I ran 'powercfg /energy' which returned a few warnings, particularly high CPU utilization from the 'Explorer.exe' process. Also, after repairing some corrupted files with 'sfc /scannow', I recently encountered a BSOD error related to 'LockApp.exe'.
I'm hoping to find some suggestions on whether these errors could be the reason for the slowness and overheating, and to figure out the best way to fix these issues myself without resorting to third-party apps if possible. If it turns out I need professional help, that's okay too—I'm just feeling pretty lost right now. The computer details are:
- Device Name: HP
- Processor: Intel Core i5-6400T CPU @ 2.20GHz
- RAM: 16.0 GB (15.9 GB usable)
- OS: Windows 11
- Storage: 1.82 TB with 79 GB used
- Graphics: 2 GB (multiple GPUs)
- The computer is about 10 years old and Windows is up to date.
Let me know if you need more info!
5 Answers
Make sure to back up your data before making any major changes. If you're tweaking BIOS settings or installing new hardware, it's always a safe bet! Just to be cautious, you know?
It sounds like your hard drive could be the main issue here. If it’s an old HDD, that could totally explain the lag and high disk usage. Switching to an SSD would make a massive difference in speed during startup and when launching apps. It might be worth considering that upgrade!
Definitely check for dump files after the BSOD. They can give insights into what caused the crash. Look in C:WindowsMinidump and if you find any, zip the folder and upload it to a site like Mediafire or catbox.moe. Multiple dump files are better for analysis, so don’t worry if you only find one!
The fact that the fans are blazing means your CPU might be overheating. Applying new thermal paste on the CPU cooler could help with that. Check your CPU temperature in Task Manager; if it’s too hot, it can seriously affect performance!
I totally sympathize with the frustration! But don’t forget to run Windows updates just in case. Sometimes pending updates can cause performance hiccups too!

Gotcha! I’ll look for those and try zipping them up. Thanks for the tip!