If you have ever encountered this error message anytime and it didn't worked out for you then remember there is a simple solution to it as easy as deleting a file/folder. I had this error earlier while either you reinstall a VMWare or you setup a new operating system. When I got this error again just recently I wanted it to plug it on as a post to my WordPress blog so that it can help someone or myself in future..! 
VMWare Workstation - This virtual machine appears to be in use.
What we need to do is simply go to the folder where we have placed the physical files for the specific virtual machine and just delete the folders which are ending with "*.vmx.lck" and you are done.
For example in respect to current situation which we see in dialog box I needed to delete 2 folders SUSE Linux.vmx.lck and SUSE Linux.vmdk.lck. That's it and VMWare Workstation will be happy to play the Virtual Machine again without any problem.
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#1 by Vijay on November 9, 2009 - 2:14 pm
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Oh that was simple and it worked!
#2 by Ricky on November 25, 2009 - 2:50 pm
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Thank you… simple solution and really worked for me… thanks
#3 by Samuel Menezes on January 1, 2010 - 11:46 pm
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Jogue em outra pasta os arquivos de LOG e o conteúdo de Other Linux 2.6.x kernel.vmxf. Funcionou?
Agora, pode colocar tudo no lugar novamente e "Startar" sua VM
#4 by Dharmavirsinh Jhala on January 2, 2010 - 5:31 am
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I don't understand Portuguese so made a translation to English; but still could not make much sense to me. little-bit. Thanks if you can explain bit-more.
Portuguese to English translation
Throw in another folder files and content LOG Other Linux 2.6.x kernel.vmxf. Did it work?
Now you can put everything in place again and "Start" your VM
#5 by Luiggito on January 3, 2010 - 1:08 am
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thank you very much, really saved my life
#6 by Ahmed on April 15, 2010 - 7:36 pm
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thanks , its working fine now
#7 by Guest on September 17, 2010 - 4:44 pm
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HUGE presentation on the line when this happened…GREAT FIX!!! Many thanks for posting
#8 by Bob Hamill on September 29, 2010 - 2:43 pm
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Phew – you are a life save – thanks..GREAT FIX
#9 by Nikkieta on November 3, 2010 - 11:06 pm
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thanks it helped me too………………………aclty same problem occurred to me just during exam and this soln helped me to save my time in reinstalling everything thanks guys thanks alot………………………………….
#10 by Basit on May 2, 2011 - 11:44 am
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thank you sooooooooooooo much
as you said its very simple but its great
#11 by Arshad on May 9, 2011 - 9:01 pm
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Thanks worked for me also…
#12 by Clem on June 8, 2011 - 3:11 pm
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worked for me – thanks
#13 by Mr.Hak on June 17, 2011 - 6:42 pm
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Thanks worked for me
#14 by robert on August 14, 2011 - 10:50 pm
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Thanks a lot. worked for me. Simple & easy, time saver. Keep posting its resolves various users issues
#15 by Praveen on August 23, 2011 - 11:55 am
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thank you great job mate:-)?
#16 by PPK on August 24, 2011 - 1:10 pm
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THANKYOU SO MUCH!
#17 by Praveen on August 25, 2011 - 10:06 am
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thank you so much!!!
#18 by Artur on August 28, 2011 - 11:11 am
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Спасибо! Помогло
#19 by bobafett42 on August 30, 2011 - 4:48 pm
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Thank you dude ! that's worked for me
#20 by Nash on September 9, 2011 - 7:47 pm
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cheers mate, A lifesvaer
#21 by Adil on December 8, 2011 - 2:22 pm
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thanks a lot. you saved me
#22 by Wil on December 12, 2011 - 7:37 am
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Thank you!!! This is amazing stuff!