Can I run Lion in 32 bit mode?

My question is the title.
I have searched on internet & it tells me to hold down '3' & '2' keys at lauch. But this doesn't work. So is there a way to boot in 32 bit mode or not?
Thanks.

AsgardFleet82 wrote:
The reason I want to run in 32 bit mode is so that I can run antivirus scans. I know people will say there are no viruses that attack Mac, but there was a new virus in the press that attacks Mac which is called Flashback.c. I just want to be safe than sorry.
If I can't run in 32 bit mode, then can anyone suggest a free 64 bit AV?
Highlight the application icon and select File > GetInfo
There should be a checkbox that allows you to configure the app to run in 32-bit mode while everything else will continue to run in 64-bit mode..

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