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			 Junior Member 
			
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				Device: windows7-32bits 
				
				
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				win7-debug-python
			 
			
			
			I tried to use calibre on win7-32bits. 
		
	
		
		
		
		
		
		
		
		
		
		
	
	I get the error: Python function terminated unexpectedly MemoryLoadLibrary() failed loading PyQt5\QtWidgets.pyd (Error Code: 1) I got the following debug output: Microsoft Windows [Version 6.1.7601] Copyright (c) 2009 Microsoft Corporation. All rights reserved. C:\Users\jaap>calibre-debug -g calibre 2.41 isfrozen: True is64bit: False Windows-7-6.1.7601-SP1 Windows ('32bit', 'WindowsPE') ('Windows', '7', '6.1.7601') Python 2.7.9 Windows: ('7', '6.1.7601', 'SP1', 'Multiprocessor Free') Python function terminated unexpectedly MemoryLoadLibrary() failed loading PyQt5\QtWidgets.pyd (Error Code: 1) Traceback (most recent call last): File "site.py", line 132, in main File "site.py", line 109, in run_entry_point File "site-packages\calibre\debug.py", line 223, in main File "site-packages\calibre\gui_launch.py", line 61, in calibre File "site-packages\calibre\gui_launch.py", line 48, in register_with_default_ programs File "site.py", line 50, in load_module File "site-packages\calibre\gui2\__init__.py", line 8, in <module> File "site.py", line 60, in load_module ImportError: MemoryLoadLibrary() failed loading PyQt5\QtWidgets.pyd C:\Users\jaap>  | 
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		#2 | 
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			 creator of calibre 
			
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			Something is preventing calibre from loading DLLs it needs, most likely a security program/antivirus of some sort.
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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		#3 | 
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			 creator of calibre 
			
			![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Posts: 45,609 
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			The other possibility is that that DLL is corrupted, so try to repair the install or do a clean re-install
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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