I tried everything and it doesn't work.
My firewall is disabled and the testconnection is working :
DNS test
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Is this the correct remote IP: 10.1.117.158
If not, please check for DNS problems
Is this the correct computer name: X2245A
If not, please check for DNS problems
Remote WMI test
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Found: Microsoft Windows 7 Professionnel
\root\cimv2 Remote WMI access test OK
Remote Registry test using WMI
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Found: Windows 7 Professional
\root\default Remote WMI access test OK
Still I get this error with my Windows 7 : The RPC server is unavailable 0x800706BA (X2245A, 10.1.117.158)
All my Windows Xp are working perfectly. Does somebody got it working in a workgroup ? Thx