A Deferred Procedure Call (DPC) is a Microsoft Windows operating system mechanism which allows high-priority tasks (e.g. an interrupt handler) to defer required but lower-priority tasks for later execution. This can go wrong and backfire on users so make sure you follow all of the solution we prepared below in order to get your CPU resources back!
Solution 1: Reinstall or Update Your Networking Adapter
If something has gone wrong with the driver related to the network device which is giving you the error and causes the “Deferred Procedure Calls and Interrupts Service Routines” processes to skyrocket in CPU usage, you can fix this problem simply by updating or reinstalling the driver related to it, depending on the type of Internet you are using. Restarting the computer will initiate the search for drivers as the system boots and it will be installed again using the latest release. Good luck.
Note: Another quite useful suggestion would be to repeat the same process with your graphics card driver which is perhaps the most important driver on your computer. Users have reported that they were able to solve the problem after updating it so make sure you repeat the same steps as above, just make sure you locate it under Display adapters in Device manager.
Solution 2: Disable All Sounds Enhancements and Special Effects
This specific solution was presented both on several forum entries as well as on a blog written by a user who has been struggling with this problem for several days. It appears that certain computers are affected by audio enhancement on Windows PC and you should disable it in order for your CPU usage to go back to normal again.
Solution 3: Use Certain Tools to Pinpoint the Real Cause
This solution is very useful in pinpointing the problem as it can be really difficult to know just which device, driver, or program is causing the high CPU. You will need to install certain tools and the process may take a while but it’s important to stay focused as this may be your last step in solving the problem!
Solution 4: Troubleshoot the Problem Via Clean Boot
If a third-party app or a service is causing often System Interrupts, you may want to pinpoint it and disable or uninstall it in order to solve the problem. Users have reported that the issue does not appear in clean boot so you might want to see that for yourself. If the issue really does not appear in clean boot, you may want to see just what app is causing it by enabling services and startup items one by one and eliminating them.
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