Reliability and Performance Monitor - Discussion

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I've had some hard locks / crashes on my PC running Win Vista64 OS. My all around Vista score is 5.9 for my PC. I'm thinking I have a MEM leak... but unsure. I have 9 gigs of DDr3. I will run the Vista mem check. I have it set up for next restart. I ran the Reliablity and Performance Monitor. From what I could tell by the graph... I lost the stability of my PC, to Windows Auto updates almost 90% of the time. Based on this information. Does anyone have any advice as to why this would happen? Any info would be great.