installing 32bit debs in 64bit environtment

[Tomoki Taniguchi]

I have a 64bit gutsy server running.
I want to run a 3rd party program (bitdefender) which only provides a
32bit deb package.

i was reading this page
https://help.ubuntu.com/community/32bit_and_64bit?highlight=%2832bit%29

and installed ia32-libs thinking this will let me install the 32bit pacakage.
but i am still getting the following errors
<snip>
dpkg: error processing BitDefender-scanner-7.5-4.i586.deb (--install):
 package architecture (i386) does not match system (amd64)
<snip>

is there a way to get this to install?

TIA,
Tomoki