My iMac G3 700/SE Graphite likes to crash, and I do not mean parties...

Okay, I have a feeling this is probably due to insufficient RAM or overheating, but some input would be nice. My iMac has a 60GB HDD, 256MB PC133 module, 700MHz G3 CPU. It is currently running MacOS X 10.3.9. When I am in Safari, it seems that if I visit some sites (heavy data ones), Safari seems to "unexpectedly quit." When running SNES9X emulator, I can play for a while, then the iMac freezes or tells me to restart it... Any suggestions?

The inside is not dirty as I have disassembled the computer, washed and tried to buff out the casing, scrubbed rust spots out...pretty much gave it a detailing. I am quite certain the HDD is fine because I had initially gutted the iMac and was going to sell the parts that I was not using...I installed the HDD into my wintel box, put WinXPProSP3 on it, and worked beautifully...On a side note, I did not know that there was a LED built into the underside of the HDD. When I looked down one day at my PC tower and saw this greenish light shining forth from the case, I was like "what the hell is that?" Something else I find amusing...although the iMac is considerably lower tech than my desktop, even with the iMac's USB 1.1 bus (I am using a Linksys WUSB600N USB adapter), I have a stabler WiFi connection with it than my PC with the same adapter. I am frequently losing signal with my wintel box...is that not something?

I have uninstalled the emulator...I have a hunch that it was just a poorly supported version because I ran a game (Darius 3?) for quite a while, but then I switched ROMs to play MegaMan7, which ran for a bit and then crashed my machine. I have uninstalled a bunch of useless (to me) programs and repaired permissions and everything seems to be running okay...sort of.