Computer Freezes every 20 secs for 7 secs

I have this one computer two days ago, that freezes up every 20-22 seconds and stays frozen 5-7 seconds. Very annoying. I have ran TrendMicro Scan. No Change. Removed TrendMicro thinking it did it. No Change. Installed MS Security Essentials did scan. No Change. Watch CPU/Processes/Services, nothing changes at 20 secs. The only thing I noticed was at 18 sec. Network Performance Spikes and floods the little green square, then about 4 secs into the freeze all network stops, and the freeze stops about 2 to 3 secs after. I have ran malware bytes and McAfee free download tools. Nothing, can't find nothing, can't stop anything.
Oh, I disconnected from wireless, and about every half sec the blue circle blinks and disappears immediately.

Any suggestions? Solutions? Tools I should try? Thanks in advance.
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JAN PAKULAICT Infranstructure ManagerCommented:
try malwerbytes

search and destroy

cmd (run as admin)
sfc /scannow

check your ram with memtest 86
disable network cards in device manager
try clean boot

check eventlog for errors (every 20 sec)
what is your main(system) hdd operation mode dma or pio?

JAN PAKULAICT Infranstructure ManagerCommented:
or you can investigate userenv log yourself if you cant post log file on e-e

Interpreting Userenv log files
JAN PAKULAICT Infranstructure ManagerCommented:
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Please take a few extra seconds and try to put all of your suggestions in one post. At this point, the queue looks as though three different Experts are trying to help.

What is your situation for this system - network or standalone? If part of a network, pull it off until you identify and resolve the problem.

Did you run any of the rogue process stoppers prior to running Malwarebytes? Many malware variants will interfere with the MBAM scan if you don't.

Basic details and steps for you to take in these EE Articles here:

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suttons27Author Commented:
Thanks for the responses.
1. Already Tried MalwareBytes - came back Clean
2. Will try suggestions and look at eventlog
3. System 2 yrs old, so I'm guessing DMA (not sure though), its Windows 7, quad proc, 4 gb ram

1. Network computer, she won't let me unhook from network (She is the owner) I can barely even get on the computer to troubleshoot, in her eyes, its just annoying but she can still work. So I have to wait till she is in meetings
2. Yes, I have stopped processes that seemed unnecessary (did not use a program), actually sat down with user for about 30 mins and uninstalled unnecessary programs as well.

Will try your suggestions tomorrow...thanks to both of you for your responses.
"Yes, I have stopped processes that seemed unnecessary (did not use a program),..."

You really want to use a program such as "RogueKiller" to identify and stop the processes. These programs are written by people (such as Tigzy) who are way at the end of spectrum of ability for this kind of work.

Follow the steps outlined in the Articles and post back the logs that are generated.
JAN PAKULAICT Infranstructure ManagerCommented:
you could also try process explorer to see what is going on in the system (disable all unnecessary programs before you ran procmon)
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