Computer has started locking up 3-4 times a day when doing normal browsing functions. I've runb disk utility and done soft boots but it does't help.s

Computer has started locking up on a regular basis (several times a day) when doing normal internet browsing. I've gone through disk utility and safe start sequences but I see no improvement.

I've had this unit for a few years (can't remember how many)
iMAC 4,1
2 GHz Intel Core Duo
1 GB  667 MHz DDR2 SDRAM
When I go to the activity center, I see the RAM used as follows:
Free  23 MB
Wired 120 MB
Active 597 MB
Inactive 283 MB

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