Auto Time Sync is not working with RPC error

I am working on one Windows XP which is belong to my parents in law. The clock runs faster. I would like to enable the automatically synchronize with an Internet time server. The problem is it is always give me the error.
The RPC Server is unavailable.
I Google it and find some one has this problem before.
I have to enable the service called, Windows Time.
But I can not find it. It is not in the list of services.
The way to get Windows Time in is to run following command.
To restore the Windows Time Service if it has been broken. Open a command
prompt…
Start | Run | Type: cmd | Click OK |
Type: net stop W32Time hit your Enter key.
Type: w32tm /unregister hit your Enter key.
Type: w32tm /register hit your Enter key.
Type: net start W32Time hit your Enter key.
Type: sc query W32Time hit your Enter key.


Then, the auto time sync comes back normal.
All looks fine. Any one Internet time server is working.
Time is correct.