Radiator/cooling fans not working properly?

Hi, I recently had my water pump and timing belt and the thermostat changed on my car as well as one of the fans in front of the radiator. It was the one on the driver's side. But when the fan was installed and plugged in the car would not start. So, the fan was unplugged and now the other fan (on the passenger side) runs all the time when the car is on. I know one of the relays has been replaced, but what I would like to know is it okay to drive the car with just the one fan running and if so, how long, I will not have any money to put in the shop for three weeks.