[Davidmc59]

I have being using Calibre for a few years to manage my e-books and have found it great to use. Recently my Avast Anti virus changed something and Calibre will not function. i have deleted and re-installed but no difference. One of the responses I am receiving is:

calibre, version 3.25.0
ERROR: Unhandled exception: <b>CriticalError</b>:Failed to launch worker process:
Traceback (most recent call last):
File "site-packages\calibre\utils\ipc\server.py", line 227, in do_launch
File "site-packages\calibre\utils\ipc\launch.py", line 228, in __call__
File "subprocess.py", line 711, in __init__
File "subprocess.py", line 959, in _execute_child
WindowsError: [Error 2] The system cannot find the file specified


calibre 3.25 [64bit] embedded-python: True is64bit: True
Windows-10-10.0.17134-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.17134')
Python 2.7.12+
Windows: ('10', '10.0.17134', 'SP0', u'Multiprocessor Free')
Interface language: None
Traceback (most recent call last):
File "site-packages\calibre\gui2\actions\view.py", line 244, in view_triggered
File "site-packages\calibre\gui2\actions\view.py", line 327, in _view_books
File "site-packages\calibre\gui2\actions\view.py", line 279, in _view_calibre_books
File "site-packages\calibre\gui2\actions\view.py", line 106, in view_format_by_id
File "site-packages\calibre\gui2\actions\view.py", line 155, in _view_file
File "site-packages\calibre\gui2\actions\view.py", line 125, in _launch_viewer
File "site-packages\calibre\gui2\jobs.py", line 284, in launch_gui_app
File "site-packages\calibre\utils\ipc\server.py", line 245, in run_job
File "site-packages\calibre\utils\ipc\server.py", line 218, in launch_worker
CriticalError: Failed to launch worker process:
Traceback (most recent call last):
File "site-packages\calibre\utils\ipc\server.py", line 227, in do_launch
File "site-packages\calibre\utils\ipc\launch.py", line 228, in __call__
File "subprocess.py", line 711, in __init__
File "subprocess.py", line 959, in _execute_child
WindowsError: [Error 2] The system cannot find the file specified

Any help Appreciated. David