Dell Inspiron 1545 with Vista x64 Spontaneously Reboots

I'm not sure which I dislike more, Microsoft, or Dell.  The two together are an unholy union that literally keep me up at night.  Todays headache comes courtesy of them both.  The Inspiron laptop would reboot every 20-30 mintes for no good reason, and it didn't matter if it was idle, in a screensaver, or busy with an update.  After rounding up all the usual suspects (all drivers updated, 3rd party software removed, updated the BIOS, removed the antivirus, installed all OS updates, ran Dell's hardware diagnostics) I decided to call Dell. 

After a half-hour of Hell because I didn't know that the customer had acquired the laptops at Best Buy (one of Dell's support reps suggested I could only get help from the reseller) a support rep took pity on me and suggested I do a system restore to two weeks prior.  I tried that, with no dice.  She then suggested that the issue is due to some incompatible updates from Microsoft.  That's right, the updates that are supposed to make our computers safer and more stable were crashing this one out.  The support rep further suggested that I turn off automatic updates.  Fat chance, I told her, then I politely asked if she knew which updates in particular were causing the mischief.  After a relatively brief hold, she gladly informed me that the issue was caused by the following updates and suggested that if I remove them my computer would operate trouble-free.

• KB973839
• KB970653
• KB972036
• KB973874

I've removed the required updates, rebooted, ran MS Update, hid the offending updates, and have operated the computer for the past hour without incident.  I think she may have given me the correct answer - she did great, but Dell is still not on my list of recommended vendors.