[G4] Upgrade of old G4/400Mhz/OS X-Jaguar?

[Fast Primes]

Hi Folks,

I'm a Windows XP user that just got an old Mac with the following specs:

     -     400Mhz processor
     -     running OS X 10.2/Jaguar?
     -     384 meg ram--expandable to 1.5 gig via 4 slots of PC100 SDRAM 
mem.
     -     10 gig drive--7 gig free

The machine seems to work fairly well--however it's frozen up on occasion, 
sometimes with the revolving "beach ball". Is this because of memory 
constraints or should I upgrade the OS to 10.3 or 10.4?

Can the processor be upgraded to a faster one via some third party solution? 
Are new Intel CPU boards available?

How do I connect to an Windows NTFS formatted USB external drive and read 
files off it?

Thanks!

FP--books "Missing Manual", "Mac OS X Unleashed" and Robin's iMac Apps book 
are inbound from amazon.

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