Hi, 1. Did you applied All Windows Update ? If some update were deficient , KDW system install causes BSoD. 2. Did you combine Oldcigarettes API and KDW ? That causes BSoD. 3. Did you read KDW readme ? It shows how to recover from BSoD. If you can control Recovery console or use dual boot envrionment , it is easy to recover to the environment before you install. 4. I don't recommend KDW system install, Now KDW was End-of-Support , and I recomend use Extended kernel. -- I think Update Rollup 2 is normal update and UURollup is extended update.