This Static route gets erased when the system reboots. To avoid this, use the -p (Persistent) switch to the above command:
C:\> ROUTE -P ADD 10.10.10.0 MASK 255.255.255.0 192.168.1.1 METRIC 1
This writes the persistent route to the following Windows Registry key as a string value (REG_SZ):
HKEY_LOCAL_MACHINE\SYSTEM\CURRENTCONTROLSET\SERVICES\TCPIP\PARAMETERS\PERSISTENTROUTES