First try,
You also need to disable PnP OS or ACPI in BIOS setting otherwise it will not work same applies to some old bios on FreeBSD for rtl chipset so please disabled it

If that not works then
For DLINK NIC built in driver as well as one from realtek failes it is true that it works with other NICs the soulution is to get driver from following url
http://homepage2.nifty.com/mrym3/tai...-1.0.5a.tar.gz. This driver works with Solaris10 build 72 or higher. Read the READEM.TXT in the tar.gz file. You may also need to install gcc or sun c compiler.

Hope this helps