When user with Windows 7 opens a shared resource in W2008R2 Server, Server CPU usage is 100%

Hi,

When the user “User1” opens any shared resource in a W2008R2 Enterprise, the server CPU usage increase to 100%. The process affected is Kernel.exe with the 99% of CPU usage.

It occurs only sometimes and when User1 closes the shared resource, the CPU usage returns to  normal values (about 1% or 2%).

It’s a problem with User1 or his Windows 7, the rest of the domain users works correctly.

User1 has all the privileges in the shared resource, equals the rest of domain users

Any ideas?

Thanks in advance