Why SoftIce is not setting breakpoints?

I think it is not a problen of softice.
Please refer to it's readme,the section of "SoftICE Support of Unreleased OS Version"
do following steps:
Load up the softICE Settings application.

Go to the advanced page.

Add an entry of NTSYMBOLS=ON.

Get the symbols for ntoskrnl.exe and translate them to NMS format. You can either use the Symbol Retriever utility to get the correct symbols, or get them from the Support CD provided by Microsoft.

Go to the symbols page and add in the ntoskrnl.nms that you've just translated.

Now, reboot your machine.