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Apart from a suspicion you may have a faulty hard drive, the K7S5a motherboard / XP2100 combo is extremely demanding of both memory & power supply.
With the extra kit you have installed I reckon the minimum power supply you would need for reliable operation would be a good make 350W.
Memory wise branded memory like Crucial works more reliably than cheap generic & the K7s5a allegedly works better with DDR than with SDR.
About the only other thing I can think of that could cause your problems is an overheating Cpu.
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