I was previously getting the permission denied, however i changed the user to Administrator@<MACHINE_NAME> this brought be a bit further than others i've seen in here that are trying to use DCOM.

Getting connection to the virtual datacenter
Looking for the virtual machine on Hypervisor...
Virtual Machine Found
Virtual machine is already running. No startup procedure required.
Finished startup procedure... Connecting slave client
Connecting to hestia
ERROR: Unable to access Windows Registry, please check whether the SERVER service is running on the Target Workstation. [0x00001031]
org.jinterop.dcom.common.JIException: Unable to access Windows Registry, please check whether the SERVER service is running on the Target Workstation. [0x00001031]
at org.jinterop.winreg.smb.JIWinRegStub.winreg_OpenHKCR(JIWinRegStub.java:123)
at org.jinterop.dcom.core.JIComServer.initialise(JIComServer.java:479)
at org.jinterop.dcom.core.JIComServer.<init>(JIComServer.java:427)
at org.jvnet.hudson.wmi.WMI.connect(WMI.java:41)
at hudson.os.windows.ManagedWindowsServiceLauncher.launch(ManagedWindowsServiceLauncher.java:137)
at hudson.plugins.libvirt.VirtualMachineLauncher.launch(VirtualMachineLauncher.java:115)
at hudson.slaves.SlaveComputer$1.call(SlaveComputer.java:183)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.net.MalformedURLException: For input string: "<something that looks like my password>@ip address of machine"
at java.net.URL.<init>(URL.java:601)
at jcifs.smb.SmbFile.<init>(SmbFile.java:445)
at jcifs.smb.SmbNamedPipe.<init>(SmbNamedPipe.java:134)
at rpc.ncacn_np.RpcTransport.attach(RpcTransport.java:89)
at rpc.Stub.attach(Stub.java:105)
at rpc.Stub.call(Stub.java:109)
at org.jinterop.winreg.smb.JIWinRegStub.winreg_OpenHKCR(JIWinRegStub.java:119)
... 11 more