question about Etrust 6.0

Who use etrust 6.0 here? it's a product from Computer Associate. www.ca.com
I have some questions about it.

one is about its engine. etrust is a so-called AV software with double engines : inoculateit and vet. You can use just only one engine every time, not both.

which engine is better? Or which one is suitable for on-access monitor ? which one is suitable for on-demand scan?

I test these two with a virus package(zip form) which has 3550 kinds of virus in the review mode.
VET finds 3460 and inoculator finds 3760. Scan speed of Inoculator is faster than that of vet.

The other question is about the right-click menu. After I install etrust 6.0, every time I right click a fold or a file the menu appears very slowly.

any ideas