I bought formal Hal Assistant 5.0, but it failed

[nlmzh]

It is very difficult to be installed. At final step of installation, it always stops. The installation always cannot be finished. Why? What is wrong? I bought formal Hal Assistant 5.0 last month. Could you give me some support?
Thanks,

[Padriag]

It would help people to better assist you if you could tell us about  the computer you are using.  What is your CPU speed, how much RAM do you have, and how much free Hard Drive space do you have?  What version of Windows are you using?  When you look in your system tray (next to the clock) are there other applications running there, and if so, what?

The installation of Hal could fail for an of a number of reasons, such as not enough Hard Disk space, not enough system resources, or an older version of Windows.

[nlmzh]

I installed on several PC including windows98, windows2000, windowsxp. But they all failed. My PC has P4 2.8G CPU, 1024M RAM, 40G free Hard drive of 120G hard disk.
When I installed, there are anti-virus application in my system tray.

What is minimus requirement of PC?