I really kinda doubt that the heat is the issue in your case but it might just be. As I understand your using a golden orb cooler (I assume with the grease that came on the cooler). If you have the CPU voltage set to 1.9 to 1.95 and it will not go into windows, I suspect you have a dud overclocker CPU. If it goes into windows and works fine for a period of time (say 5 minutes of so) and then peters out, more than likely its a heat issue. If the 5 minutes and locks up is the scenario, take a small fan if you have one (like one of the 12 inch oscillating types) and blow on the CPU area of the computer with the case open and see if that eliminates the lockups. If it does, buy some Arctic Silver and possibly a better cooler (like an FOP32-1 Global Win).
As far as the CAS2 and AGP memory settings this shouldn't be a problem at 100 Mhz FSB because the AGP bus and memory bus are running in spec assuming you using a board desinged to suport 100 Mhz FSB CPUS. If the board is designed for 100 FSB Mhz CPUs, the board automatically adjust the AGP bus to run at 66 Mhz (the spec) and of course the memory is running at the FSB speed. If you have a via or an i815e chipset motherboard, you can adjust memory speed so do check that if you have one of these types of boards..
One other thing I would suggest. If you have a no-name slocket, consider buying a Abit slocket. With a relatively low cost of about $10 to $12, this might be the solution. Also, if you have a soundblaster live sound card, you may want to download the latest drivers (not the liveware but the drivers themselves). The original drivers shipped with this card had problems with FCPGA processors particularly when used in tandem with an overclocked FCPGA CPU. I generally see this problem at FSB over 100 Mhz (not at 100 Mhz) but I would update the drivers anyway just to eliminate the issue.