vSphere Delete VM Snapshot

Hello everyone,

I have a client with VMware ESXi 4.1.0 and vSphere Client 4.1.0 and there is one virtual machine, which is the DC, that has one snapshot taken, as you can see from the following screenshot:

In snapshot manager I cannot see the snapshot:

I need to delete this snapshot, and I really dont know how, I have tried to open solely the vmx file of this virtual machine in VMware Workstation to see if the snapshot manager finds any snapshot but from what I could see it does not.

Any ideia on how to solve this problem?

Thanks everyone!