Look for a tag that starts with "<process:Server", and note down the name= parameter value
Then go to Control Panel>Admin Tools>Services, find the entry for the WAS server, right click and choose Properties. In the "Path to executable" field, after the path to the wasservice.exe, look for a parameter in quotes that should look like this:
"IBMWAS70Service - stconsoleserver"
Make sure to change the string stconsoleserver so that it exactly match the name= parameter in the XML file mentioned above.