I succeded finally to go further with installation, through interactive text desktop way, which is much faster than the default interactive one, but Solaris (10.5) only "sees" the Windows C partition and the extended one.
As i don`t want to get rid of Windows, or make the rest of the drive only for Solaris, pls advice what to do next - i have "prepared" (right now is FAT32, but before was unformatted and still "invisible" as "right place to install there" for Solaris) on extended volume 10 GB for it... just how can i point it to install there? What FS is to be seen as "OK"?Or, what to do?
In addition, i have only 1 hard disk, so that`s it, those 10 GB is the best i can do for Solaris.

You have 4 partition slots in the partition table in sector 0. The first is a primary for windows. The second is an extended partition that points to the chain of logical partitions. So define another primary partition for Solaris. Set the type to 0xBF and Solaris 10 will recognize it. Now install Solaris in that 10 GB primary.

OK...i have to admit... i did it through wind - partition magic, but i did it... now Solaris is ON (installed and functional), ready to fill my needs of testing, which...speaking about:
- Why keeps booting without network card interface enabled??? I installed the drivers, enabled the card, dhcp created files, modified files (hostname, defaultrouter).... everything was ok until next reboot, when surprize, only the loopback interface is "seen".
I had lot of work at my job, and still have, so if anybody knows a quick answer to this, thanks, if not, i`ll search and find something, sometime...

which files have you edited and created?

here is a good description:
Setting Up a Solaris DHCP Client

In the most simpliest ways, i want my Solaris 10 to have a static IP as 10.10.10.100, going "out" through the switch we have here - 10.10.10.1 and if not possible, at least to have automated enabled network interface with dhcp on it.
Now i am confrunting with doing after every reboot "plumb" and "dhcp primary" lines on network interface...
I`ve read not only here but also on other results of google, tried many other things, nothing worked until now and AFTER the reboot.

So, it is like this:
- my interface is bfe0
# dladm show-dev
bfe0 link: unknown speed: 0 Mbps duplex: full

- created and fill in the hostname like this in /etc:
# cat hostname.bfe0
laptop

- created and fill in the gateway (switch) like this in /etc:
# cat defaultrouter
10.10.10.1

- modified etc/inet/hosts to be like this (also etc/hosts and etc/inet/ipnodes are the same):
# cat inet/hosts
#
# Internet host table
#
127.0.0.1 localhost loghost
10.10.10.100 laptop laptop

- modified this file:
# cat inet/netmasks
#
10.10.10.0 255.255.255.0

But after every restart i have to plumb the interface and it is not enough:
# ifconfig bfe0 plumb
# ifconfig -a
lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1
inet 127.0.0.1 netmask ff000000
bfe0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
inet 0.0.0.0 netmask ff000000
ether 0:15:c5:6b:a:33

As you can see my IP is set to 0.0.0.0 so i have to let it to DHCP to do it:
# ifconfig bfe0 dhcp primary
# ifconfig -a
lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1
inet 127.0.0.1 netmask ff000000
bfe0: flags=1004843<UP,BROADCAST,RUNNING,MULTICAST,DHCP,IPv4> mtu 1500 index 4
inet 10.10.10.10 netmask ffffff00 broadcast 10.10.10.255
ether 0:15:c5:6b:a:33

So, basicly the static IP i want - 10.10.10.100 is not set, but not at least the interface bfe0 is up after restart, every time i have to plumb it manually.
I`m sure there is some mistake of mine... maybe i modified or created some other files.
I read this upper link "Setting Up a Solaris DHCP Client" but still the same problem: bfe0 is not up after reboot and after i enable it it returns me that 0.0.0.0 address...

- one last thing, content of etc/path_to_inst:
# cat path_to_inst
#
# Caution! This file contains critical kernel state
#
"/pseudo" 0 "pseudo"
"/options" 0 "options"
"/xsvc" 0 "xsvc"
"/objmgr" 0 "objmgr"
"/scsi_vhci" 0 "scsi_vhci"
"/isa" 0 "isa"
"/isa/i8042@1,60" 0 "i8042"
"/isa/i8042@1,60/keyboard@0" 0 "kb8042"
"/isa/i8042@1,60/mouse@1" 0 "mouse8042"
"/ramdisk" 0 "ramdisk"
"/cpus" 0 "cpunex"
"/cpus/cpu@0" 0 "cpudrv"
"/pci@0,0" 0 "npe"
"/pci@0,0/display@2" 0 "vgatext"
"/pci@0,0/pci1028,1c9@1d,7" 0 "ehci"
"/pci@0,0/pci1028,1c9@1d,7/storage@1" 0 "scsa2usb"
"/pci@0,0/pci1028,1c9@1d,7/storage@1/disk@0,0" 0 "sd"
"/pci@0,0/pci1028,1c9@1d" 0 "uhci"
"/pci@0,0/pci1028,1c9@1d,1" 1 "uhci"
"/pci@0,0/pci1028,1c9@1d,2" 2 "uhci"
"/pci@0,0/pci1028,1c9@1d,2/mouse@1" 0 "hid"
"/pci@0,0/pci1028,1c9@1d,3" 3 "uhci"
"/pci@0,0/pci8086,2660@1c" 0 "pcie_pci"
"/pci@0,0/pci8086,2666@1c,3" 1 "pcie_pci"
"/pci@0,0/pci1028,1c9@1b" 0 "audiohd"
"/pci@0,0/pci8086,2448@1e" 0 "pci_pci"
"/pci@0,0/pci8086,2448@1e/pci1028,1c9@0" 0 "bfe"
"/pci@0,0/pci-ide@1f,1" 0 "pci-ide"
"/pci@0,0/pci-ide@1f,1/ide@0" 0 "ata"
"/pci@0,0/pci-ide@1f,1/ide@0/sd@1,0" 1 "sd"
"/pci@0,0/pci-ide@1f,1/ide@0/cmdk@0,0" 0 "cmdk"
"/pci@0,0/pci1028,1c9@0" 0 "agptarget"
"/iscsi" 0 "iscsi"
"/agpgart" 0 "agpgart"

.... help?
- and forgot about this (nameservers are some dns servers i know):
# cat /etc/resolv.conf
nameserver 193.231.233.1
nameserver 193.231.233.8
# grep hosts /etc/nsswitch.conf
# "hosts:" and "services:" in this file are used only if the
hosts: files dns