I have followed the below .
1.Selected Particular VM , Win2k8 Std 32 bit
2.converted the disk to Thick from Thin
3.Powered off Vm and tried to enable the FT
4.Process has started and completed but results with error :
VM configuration: 1vCPu /5Gb vRAM /Vmware hardware ver 8
"" insufficient resources to satisfy configured failover level for vsphere ha ""