Sorry was researching and don't know how.

This is what my cgminer.conf has then I use a .bat file to launch the miner without a diff flag if there is one?

"api-description" : "cgminer 4.8.0",
"api-listen" : true,
"api-mcast-addr" : "224.0.0.75",
"api-mcast-code" : "FTW",
"api-mcast-des" : "",
"api-mcast-port" : "4028",
"api-port" : "4028",
"api-host" : "127.0.0.1",
"btc-address" : "secret",
"expiry" : "120",
"hotplug" : "5",
"log" : "5",
"queue" : "1",
"scan-time" : "60",
"shares" : "0",
"suggest-diff" : "8"
}