Am using an internet modem. The data on the modem runs even when i think i have stopped all programs that might be using the data. How do i find the program using the data? Should i install a software? What is a recommended one?

My Computer
- Computer Manufacturer/Model Number
- Toshiba
- OS
- Windows 7 Home Premium 64 bit
- CPU
- Intel(R)
- Motherboard
- Dont know
- Memory
- RAM
- Graphics Card(s)
- Intel
- Sound Card
- WDM
- Monitor(s) Displays
- Generic PnP display
- Hard Drives
- Toshiba MK6475GSX
TSST corp CDDVD TS-L633F
- PSU
- Dont know
- Case
- Dont Know
- Cooling
- Dont know