Mac keeps freezing every 15minutes even when re-installing of OS

I tend to have this issue after I've updated my latest OS to 10.4.11... My mac has the tendency to freeze every 15-20minutes... After checking my hardware realising that it's still in good working condition, I downloaded main menu to do a clean up... It has more or less fix the problem but it comes back after I updated my Safari browser...
Unknowingly what's the underlying cause, I decided to re-install the OS... The more frustrating thing is that it hangs even when I re-installed the OS, approximately about 15 minutes before the entire set-up is done... I've no choice but to restart my mac.. But not it seems I can't really boot it as it even hangs during start up...
Really at wit's ends... Can anyone help??
Thanks

Hi S.U,
No problem at all.. But really thanks for your advice which I think it might be the case...
My mac is the very first G4 batch and it's about coming to 5 years old... My harddisk crashed 2 years back and had sent it for a replacement from a 30GB to a current 120GB HD... I do face initial software problems after the fix and I got it back again and the technician install my mac with his Tiger installation disc instead on what's my initial package comes with... It worked fine subsequently for the next 2 years till recently, especially I've not been using my mac for months, the hanging issue came... Frustrating as it is, I had thought it's due to the upgrading of the OS and security measures that's too taxing for my current hardware... But now since you mentioned about the additional hardware problem that any hardware software can't detect, I'd think it stands a pretty high chance since I had once had my harddisk replaced and my mac being too old and wear and tear could be a problem...
I had managed to do an Erase and Install the OS last night despite after several hanging sessions during the reinstallation program... I've updated my OS to the latest 10.4.11 with security added... Right now my mac appears to look fine after operating for several hours of software updating, reinstalling of all my other applications as well as moving my back-up files back to the system... I hope after all these, the hanging issue won't persists though I have this feel that it might not be fully resolve and my sister is saying that I should get a new mac with extra huge space RAM and processor to suit an extra huge consumer like me...
Well, for now I just have to KIV and I hope this current mac of mine can stay on till I get a new mac...
But anyway, thanks for your advice, will look into it seriously if the hanging issues come back again...

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acpqo wrote:
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