I have Windows Vista installed on my computer and it is running very slowly. When I checked in the task manager then it was showing me that svchost.exe was using 100% Cpu. After that I used the system internals process explorer then it showed me that the CPU is ntdll.dll file which is the cause of this issue. So I ran antivirus and anti-spyware software on my pc, but nothing was caught. I also logged into Safe mode and cleared all the softwaredistribution folder and it seems that the slow running doesnt happen in this mode, since the services are disabled by default, thats why. I then tried to update Avg antivirus and it needed some windows update file which I applied, but there after I got the installation failed message with an error message 0x800706bb. So, is there anyone who can help me sort out this problem. Thanks
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