how do I fix C:\windows\system32\newdev.dll - not a valid win 32 app?

The Laptop seems to be slowing down to a crawl eversince the newdev.dll window popped up.

Question Info

Last updated May 17, 2019 Views 5,273 Applies to:




1.     Do you receive the popup at the startup (after the computer started)?

2.     Have you made any changes to your computer prior to this issue?



Method 1:  Place the computer in clean boot and see if that helps.


How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7:


Note: After you have finished diagnosing, follow step 7 in the article to boot to normal startup.




Method 2: Run SFC Scan.



How to use the System File Checker tool to troubleshoot missing or corrupted system files on Windows Vista or on Windows 7:



You may also refer:

Optimize Windows 7 for better performance:


Note: Any data files that are infected may only be cleaned by deleting the file entirely, which means there is a potential for data loss.

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