not enough space to install ATI driver

Greetings to everybody.
I'm new to Linux but I managed to install Debian Etch on my Dell Vostro 200.
For about a week, I've had a hard time configuring onboard NIC (Intel 82562v-2).
After solving the problem with a struggle that continued days, I have another problem.

When I tried installing ATI driver after building Debian/etch specific packages, the installation just failed with an error that I couldn't understand.

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dell@delldebian:~/Desktop/Downloads/ATI_X64$ sudo dpkg -i fglrx-driver_8.512-1_amd64.deb
(Reading database ... 92250 files and directories currently installed.)
Preparing to replace fglrx-driver 8.512-1 (using fglrx-driver_8.512-1_amd64.deb) ...
Stopping atieventsd: done.
Unpacking replacement fglrx-driver ...
dpkg: error processing fglrx-driver_8.512-1_amd64.deb (--install):
failed in buffer_write(fd) (9, ret=-1): backend dpkg-deb during `./emul/ia32-linux/usr/lib/dri/fglrx_dri.so': No space left on device
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Starting atieventsd: done.
Errors were encountered while processing:
fglrx-driver_8.512-1_amd64.deb
dell@delldebian:~/Desktop/Downloads/ATI_X64$
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/emul directory seemed to share its space with root

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dell@delldebian:~/Desktop/Downloads/ATI_X64$ df -a
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda5 264445 253505 0 100% /
tmpfs 1031132 0 1031132 0% /lib/init/rw
proc 0 0 0 - /proc
sysfs 0 0 0 - /sys
procbususb 0 0 0 - /proc/bus/usb
udev 10240 108 10132 2% /dev
tmpfs 1031132 0 1031132 0% /dev/shm
devpts 0 0 0 - /dev/pts
/dev/sda10 58554976 378608 55201936 1% /home
/dev/sda9 381138 10310 351150 3% /tmp
/dev/sda6 4806904 1964076 2598644 44% /usr
/dev/sda7 2885780 593664 2145528 22% /var
nfsd 0 0 0 - /proc/fs/nfsd
rpc_pipefs 0 0 0 - /var/lib/nfs/rpc_pipefs
dell@delldebian:~/Desktop/Downloads/ATI_X64$
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With no available space, I don't know what to do to make it work.

Another question I have is that how do I know whether I've successfully installed all drivers for my devices or not. (As Windows Device Manager shows yellow ! mark when you need to install a driver for a device)

Any help/advice would be appreciated and thanks for reading.

-Andrew