what VMware platform is this guest in question running on? Make sure the VM has no limits set.

... or what are you referring to by saying

>The performance is very slow and CPU usage 90% *****

Please provide as much information as possible

Iam using Windows 2003 VM

no are you running esx/esxi, vmware server, worstation??

and is the hosts cpu running at 90% or is the vm vcpu running at 90%

Thanks for ur quick response

Iam using ESX and hosts cpu running at 90%

Thanks