3rd party apps which secure MS Windows - such a thing?

[Jesse Manibusan]

Does anyone know if such a thing exists: a third-party
application which allows stronger  security on an MS
windows based machine?  

I would like to find the same type of appplication for my
Win98 machine.  Unfortunately, I am stuck with Win98 so
moving up to Linux is not an option.  I could conceivably
upgrade to Win2000 permanently but under Win2000, my
laptop's console port is not recognized.  Haven't been able
to figure out why.

Third-party vendors for the the PalmOS offer such products
which are add-ons to the unsecure PalmOS and basically
handle the authentication tasks of the PalmOS instead of
allowing the PalmOS to do it directly.

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