Using Norton antivirus without installing it?

[Shuja]

Because the NAV is quite resource hungry, I First install it over my WIN 98 SE OS, create Five diskette, and uninstall the NAV.

I prepare a batch file and programming in such a way that using the batch file, I occasionaly check virus using these programme.

Here my problem is how to upgrade these defenition dikettes without installing NAV all over again?
any suggestions?