Windows Logo testing Warning for my driver

Hi

I recieve the following warning message when i want to install my driver on Win XP :

The software you are installing for this hardware :
MyFSFilter Class
has not passed Windows Logo testing to verify its compability
with Windows XP
...

Consider that my driver package containes :
MySys.sys ---> is my driver
MyInf.inf ---> my INF file to install the driver
MyCat.cat ---> is my catalog file
MyIns.bat ---> a bat file which uses the following command line to install the INF file : rundll32.exe setupapi,InstallHinfSection DefaultInstall 132 .\MyInf.inf

All of my files has been signed . but i don't have the "WHQL Digital ignature" , does it cause the problem ? Is there any solution to ignore this option ? or may be some special setting in INF/Cat file could solve the problem ? !
I read all the MSDN and IFS kit , but i didnt find anything to over come this warning...