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RTHDCPL.EXE – Illegal System DLL Relocation

This error suddenly popped up on my computer after starting it:

RTHDCPL.EXE – Illegal System DLL Relocation : The system DLL user32.dll was relocated in memory. The application will not run properly. The relocation occurred because the DLL C:\WINDOWS\system32\HHCTRL.OCX occupied an address range reserved for Windows system DLLs. The vendor supplying the DLL should be contacted for a new DLL.

My reaction: What the heck?! I just started my computer, haven’t done anything yet and I am receiving this error?! What happened? So, instead of surfing the internet and blog hopping, I ended up googling a fix for this error. After a series of googling for relevant keywords (googling for the exact message returned zero results) on that error message, I finally found the fix for the problem.

So, what really happened? I haven’t done anything yet, right? Why a sudden error? Is it some kind of a time-activated bug? No, not really. What happened was that the last time I shutdown my computer, Windows installed some fixes from their Automatic Updates. And ironically, after restarting, instead of having a better Windows version, their fix ruined something. Some kind of a conflicting memory allocation. So, that’s it. Their fix fixed something and at the same time, unfixed something. LOL. And the fix for this fix was just released 2 days ago.

Yes, this is just a 2-day old problem. And that’s why I’m blogging it. Hope this blog-post-for-microsoft-error bring me some traffic. =)

Ok, just follow this link to see the fix to the error that their idiotic fix made.

That’s all!

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Marhgil Macuha

Marhgil Macuha is a Computer Engineering graduate of Batangas State University. He is currently a Senior Solutions Developer at a Canadian IT company.


  1. Hi there!

    Heh, I’ve just encountered this error upon startup. My reaction was also similar to your and many thanks for the link – it saved me time.

    All the best,

  2. Same thing with me,.only exact google search found your site,and your fix,.well done,and thank you


  3. Yes just download the latest Realtek audio drivers or any other driver it complains about, a windows security update caused the error. Update #KB925902 is the cause.

  4. Thank You; It is a beneficial artical… I’ve just solved the error 🙂

  5. I also encountered this error on startup, A google search found your site and I am fixed up and running without error.

    Thank you


  6. Thank you! Exact google search also found your site. Found it to be very helpful. Thanks again!

  7. Keith in Las Vegas

    Thanks for the posting! Ran into this error helping my brother-in-law set up a new laptop. Typical M$! haha.

  8. Many thanks, your blog has saved me lots of time with this error.

    All the best

  9. Hey,

    You saved me as well. Cheers for posting this blogs.

  10. Hello

    Many thanks for your posting to fix this bug. Its obviously easier to get a solution from you than Microsoft!


  11. Marhgil, Thank you very much for your posting you were certainly “on the ball” with this error you have saved the day. I have now fixed the Windows problem update and I am up and running smoothly again. Well done.

    Regards Owen

  12. Thanks a lot. You saved me a heap of time. Wonder when the fix to fix the fix that fixed the fix that…..will be out:)

  13. what is this i keep getting when i sign in. rthdcpl.exe-illegal system dll relocation. can you solve it for me tks.

  14. Thanks for all your comments! It’s my pleasure helping you out. 😀

    @esther… kindly read my post. Just follow the link to the Microsoft page, ok, here is the link, and there, you can download a hotfix that will solve this problem. Hope this helps.

  15. Thanks–couldn’t figure out what I did to cause this. Problem solved!

  16. Oh my god! Thank you. I thought I had a virus and actually had to download everything again after I decided to use my system recovery disc. I’m so glad that I’m not only one who was having this problem

  17. This blog really helped me fix this problem. wish MS comes up with some way off telling its customers such problems

  18. Thank you for publishing this fix. You saved me lots of time. I wish I could buy you lunch.

  19. I’m glad that Google directed me to your site for the link to the fix. Great work.

  20. thanks for the link!

  21. I have finally fixed this problem thanks to you. Whilst there is Microsoft there will always be problems!!!. Thanks for your help mate.

  22. it is highly appreciable to have such kind of help
    Bundle of thanks

  23. Thanks for your help with this – it sorted my problem promptly.

  24. In case article id 935448 as mentioned in this post was unable to solve your problem, try what I did: http://vishnurao.com/blog/2007/04/26/rthdcplexe-illegal-system-dll-relocation-caused-by-update-kb925902/

  25. Thank you, thank you, thank you. I used your advice to get started, and got my problem fixed. I went to MS, and got the latest fixes, but it didnt solve the problem. i then typed in DLL relocation to their search engine, and directed me to the exact fix that i needed to download. That took care of it.

    Here is Microsoft’s official fix, which fixed mine.



  26. Thanks for ur blog, now the Real HD audio control panel is working..

    Tell the Microsoft people to sit quite and tell them not to make these kind of bad updates for XP. I don’t know why that update was required???

  27. Thanks for the post – it helped me out too! BTW – I’m the guy who built Subtle for WordPress, so it’s fun to hit on a random site using it. Good luck with everything!

  28. Hey,

    Thanks for youur solution; it worked, unlike other websites which make the problem worse. I also have a question for you. Should I keep installing Windows Updates? Because if I continue this kind of problem could occur again.


  29. hello everyone, i too had encountered this error. the problem is after monitor displays the error msgs it just restart and restart all over again, i don’t know what to do now… ps. i am not that too technically inclined with some computer jargons, so could you spare me some knowledge on how could i fix this problem, many thanks

  30. What they said !! Great work getting the fix, and even better posting it. Thanks, Dude 🙂

  31. ei.. mag post din ako neto huh? hehehe 😀

  32. Definitely you can make money blogging, but first of all you have to show people who you are and what is your best side. People must see a professional, not a greenhorn who just wants to suck money from their pockets.
    This info is very useful. Moreover everyone can see that it works fine for your website. This is the proof that you know what you are talking about and your articles are worth reading :).

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