A friend of mine experienced a blue screen problem. It was sudden, he was only browsing the internet. Code is BCCode: 19 BCP1: 0000000000000020 BCP2: FFFFF900C280F000 BCP3: FFFFF900C280F240 BCP4: 0000000025240000 OS Version: 6_1_7600 Service Pack: 0_0 Product: 256_1 I can't find what is reason of the problem. There was only flash drive connected from not so common hardware. The computer is running Windows 7 Ultimate.