Sorry for my poor english, I just install vista ultimate x64 (with sp1), but i have a trouble these days. vista can sleep after 1 hour, but when i wakeup it, and few minutes later,computer will restart automatically. here is information. and attached file is error xml Problem signature: Problem Event Name: BlueScreen OS Version: 6.0.6001.2.1.0.256.1 Locale ID: 1033 Additional information about the problem: BCCode: 4e BCP1: 0000000000000099 BCP2: 000000000006AAAC BCP3: 0000000000000002 BCP4: FFFFFFFFFFFFFFFF OS Version: 6_0_6001 Service Pack: 1_0 Product: 256_1 Please help me . Thanks in advance. error.xml