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It does sound like a hardware problem though and therefore not something that a clean install would fix. Sometimes you just get components that sit uneasily with each other; I guess it's the slight risk you take when not buying a complete system from somebody like Dell as all components would have been tested together extensively.
It's only ever happened with one of my computers - all the components worked fine in different machines, but put them all together and it just causes problems every now and then, with the trademark "windows has been shut down to protect your computer" and then the message "windows has recovered from a serious error" upon startup. It always seemed to blame the problem on my display drivers, yet they were completely up to date and the card worked without a hitch in a different computer.
Assuming it's not this however, your random reboots are likely caused by either
1) inadequate power supply (you mentioned you've spent money on upgrades recently, did you upgrade the PSU as well?)
2) overheating - does your motherboard allow you to view system temps?
3) dodgy memory (less likely but still worth a check)
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