HT4628 How to solve WIFI Maverick Upgrade Problem?

Hi guys, so I have explored all options on the site and forums so far. After my upgrade to Mavericks I cannot find my wifi signal, or very very rarely.
It never stays. Often there are "connection time out errors". There are 2 iphones, 1 ipod, a old Apple powerbook, and Windows7 Machine all connected to the signal, never a problem. Up until my updgrade to Mavericks it also was strong, fast, connected, 500 feet away!
I am 10 feet away from the wifi device. I also have one other signal I do get but it drops continuously and will not stay. Its a very slow connection which I am writing from now. But at least I see that one!
What I have tried to fix this:
Restart
Repair Disk Permissions ( about a thousand times...) -Failed
Force Quit(Hard Reset) -Failed
Reset SMC -Failed
Delete all network settings and keychain info. -Failed
Reset Router -Failed
Diagnostics -Failed
Joined network in "Safemode" and restarted. -Failed
Change channel signals -Failed
This is really causing me productions problems since I earn my income by being online
I have not even done the last big security update because I cannot stay online long enough to get that complete!
Does anyone have any more ideas? I am scared to reset PRAM... the last thing I have not tried (I once tried that with one of my former macs and my logic board died.)
Please advise, I am so frustrated. I just need to work...
Do I ditch Mavericks? Go back to Snow Leopard or maybe it was Tiger...? And if so, how?
All this as my i wifes phone, a powerbook, lenovo windows computer all happily stay connected. My ipod and iphone have no problems even 900 feet away.
My stats... running 10.9.1
Model Name:          MacBook
Model Identifier:          MacBook6,1
Processor Name:          Intel Core 2 Duo
Processor Speed:          2.26 GHz
Number of Processors:          1
Total Number of Cores:          2
L2 Cache:          3 MB
Memory:          4 GB
Bus Speed:          1.07 GHz
Boot ROM Version:          MB61.00C8.B00
SMC Version (system):          1.51f53
Sudden Motion Sensor:
State:          Enabled

Just an update, when turning off icloud access to the Keychain, my wifi signal appeared and I tried to join it. But had connection time out error.

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user8818950 wrote:
Hi,
My desktop consist of harddisk capacity of 300gp,which consist of the OS windows xp.
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>
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>
>
please help me

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HT4628 How to solve WIFI Maverick Upgrade Problem?

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