Thanks all for helpful response. My PC is absolutely virus free (tested by avg, Kasparsky). For this problem I tried to boot in safe mode. But it does not run in safe mode too. I've replaced boot.ini, *krnl.exe, ntldr, NTDETECT.COM files and tried Recovery Console withe expand,fixmbr command. I've also disable automatic restart option. But same position. I think it is Ausogics Problem. Because I've used Ausogics in 3 PC and I've faced this problem in every PC.