Skuzzy, I got this message after the most recent lockup...  "The system has recovered from a serious error"  A log of this error has been created. here is some of the info.
BBCode : 10000050      BCP1 : E190881c    BCP2: 00000000   BCP3: BFC6363D
BCP4: 00000001          OSVer : 5_1_2600   SP: 3_0              Product: 768_1
Definately driver related.