1. Check Google Drive icon in task bar.
2. If icon is not available then go to Start -> All Programs -> Google Drive and click on Google Drive icon
3. If Google Drive icon is available but status is disconnected then follow the steps
3.1 Right click on Google Drive
3.2 Make sure correct google account is selected. For Example in picture below it is showing baanimilk.mcc(at)gmail.com.
Select the correct account if wrong account is attached.
3.3 Click on settings (Right Side at Top)
3.4 Un-check the pause button if it is checked.
3.5 Now click on Quit Google Drive
4. Go to Start menu & run Google Drive again
5. If status is pause then click on resume
6. Make sure that Google Drive is connected to baanimilk.mcc@gmail.com account
*** If the problem persists, contact IT Department