Puppet users - Jun 2014 - [puppet on windows] notice: Run of Puppet configuration client already in progress; skipping

Hello,
I use puppet on windows, many servers works perfectly but I have19 servers 
in out of sync state... 
When i launch a puppet test on them, I have the following error message: 
notice: Run of Puppet configuration customer already in progress; skipping

I tried a puppet agent --enable then delete the file puppetdlock but it was 
not found. 
The client and server have the same version (2.7.20) 
The node OS is Windows Server 2003 SP2 

Do you have any ideas? 

Thanks a lot, 
sinc

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