My computer freezes for 5 seconds for up to 4 minutes (In that range.)
Sometimes it is selective applications, sometimes all of them. My explorer.exe freezes 100% of the time this occurs.
Analyzing wait chains using resource monitor (perfmon) tells me that "Threads are waiting to finish Network I/O". The thread numbers are always random and don't seem to really point anywhere... At least not that I'm aware of. (I attempted to use process explorer but had issues when trying to install the debugging tools required for viewing threads to work.)
System health checks indicate no issues. MemTest86+ reports no issues with my RAM (I ran 7 passes overnight). Voltages are within range, my computer temperature never rises over 50C... CPU usage does not spike unpredictably during a freeze or hang. Chkdsk finds no errors, bad sectors, etc... Another program I installed to look at my HDD (CrystalDiskInfo) reports that everything is working. The caps on my motherboard are not bloated or leaking. Everything is plugged in where it should be. I am not experiencing any form of data loss or corruption on my HDD. I have done a 'soft reformat' where I replaced all of my windows files (Everything else got moved to windows.old). My drivers are up to date, I do not have a program that automatically installs new ones for me and the issue did not occur upon installing a driver.
My computer's performance is actually surprisingly fast, the only issue are these intermittent freezes. I have never experienced them in the time I've used this computer until this point. The only symptom appears to be the seemingly random freezes of processes be they games, software, or native windows functions. Sometimes they report as "Not Responding" but for the most part they do not. I am able to move my mouse and make use of any other application that hasn't frozen. My computer can go for several hours without freezing before it has a period of constant freezing... These periods last for about 5-30 minutes before unhindered usage can resume.
I would reformat, but I have no method of backing up all my files externally (Around 30GB).
"detected NTDLL code modification:
ZwEnumerateKey 0 != 47, ZwQueryKey 0 != 19, ZwOpenKey 0 != 15, ZwClose 0 != 12, ZwEnumerateValueKey 0 != 16, ZwQueryValueKey 0 != 20, ZwOpenFile 0 != 48, ZwQueryDirectoryFile 0 != 50, ZwQuerySystemInformation 0 != 51Initialization error"
Initially I believed the issue to be a rootkit, but according to Gary (Oh My) my computer appears to be completely clean.
You can reference that topic here.
Any help sorting the issue out would be greatly appreciated.
(I'm running Windows 7 Home Premium 64-Bit by the by.)
Edited by Kairyn, 21 October 2012 - 10:57 AM.