driver resource confilct in the device manager

[kota]

Hi,

I am working on WDF PCI driver, when i installed new WDF driver, which
actually detects, if any old driver is installed, if so, it detects and
removes old driver setup, after the removal is complete, my new driver will
be installed.
After the installation, I obsered that device driver is not functional,In
device manager, it shows that, there is
a resource conflict, system to be restarted to resolve the resource conflict.

Though there is conflict, after i installed the new driver XP-32, system
doesnt shows the message that, system is required to restart, but it shows
in device manager.
After i restarted the system, device works fine.

Old driver installed through: Install sheild setup, which is NT model driver
New driver: Using WDF model & using DIFX toools to install the driver and
Visual studio setup & deployment wizard supported through DPINST tool.

Questions:
1> When my new driver installed, why the system doesnt show that, it is
requied to restart

2) Is there any way to detect the system restart required through VS 2005
Setup & deployment wizard and show a message to the user, so that user can
restart the pc

3) After my old driver got installed, using any tool like devcon or any
other.., can i free the PCI driver resources?, so that, before new driver
will be installed, it wont get a message about resource conflict?

Thanks,
Kota