Killing Intel Wifi Link 5100 AGN in VAIO...default 7 driver, VAIO 7 driver, VAIO Vista Driver, driver from Intel site, all failing, why?

Hi there;

Before reading the question, keep that in mind that the wireless driver in the device manager has no x or ? signs and 7 says ok, I recognize your driver perfectly without an issue, so put it simply, my problem looks like some halloween issue.

I have a problem with reputated VAIO and Windows 7.

The issue starts while I was installing 7, 7 says ok, let's connect net, I input my credentials which is 8 character with WPA (not WPA 2 since router has no support for this)
Authentication is as PSK
Encryption TKIP

Then I failed to connect my wireless network. I say ok, let's try out for VAIO original 7 driver and no joy again, everytime it fails and I got windows was unable to connect to error.

I say ok, let's try out VAIO  Vista driver, same thing occurs.
I say ok, let's try out Intel's original driver that it detects in its site, same thing occurs.

I say, hmm, although I uninstall the drivers from device manager, let's delete those drivers manually. I found out all drivers from detail and delete them but no joy.

Then I tried out hdwwiz.exe and manually adding driver with the above combinations and still no joy.

Then, I tried out to configure the adapter settings from advanced tab by clicking configure on the adapter.

I changed Roaming Aggresiveness as highest and again no joy with above combinations. I changed some other settings there too but no joy and everytime I uninstall and install the driver, it gets its original settings.

I created wireless profiles according with my router settings in my machine but still I cannot have the wireless.

Note that the wireless connection is working perfectly with my other laptop and even in the same laptop with Ubuntu.

So, what should I do right now?
Please do not say change your router. I cannot.

I haven't tried with other wifi but I need my 7 to be working with this router, so even it's working with other wifi, it is not the case.

All the steps in this question are also applied with no password authentication and WEP and 802.1x authentaications too...

It was working in the preinstalled Vista Home Premium 64-bit.
I am now in 7 Pro 64-bit. (the very final release)

Imho, this is the hardest question of among all my questions.

A clue: With the intel driver from its site, I have created a profile, and it gets with WPA for about 5 mins then gone, note that I also reset the modem for 10 seconds, also cold boot the modem and 7 too for each steps.

I can reach the modem by typing its IP with my LAN.

All the 7 firewalls are closed. No antivirus. No virus since it's a scratch.

Another laptop I talked above which has Intel 3945ABG can connect with the settings.
It has the settings as:
Adhoc 802.11b/g 11
802.11a 36
Mixed Mode: CTS-to-self enabled

Right now, VAIO has advanced properties as:
802.11n Channel Width for band 2.4 20 MHz Only
802.11n Channel Width for band 5.2 Auto
802.11n Mode Enabled
Ad Hoc Channel 802.11b/g 11
Ad Hoc QoS Mode WMM Disabled
Fat Channel Intolerant Disabled
Mixed Mode Protection CTS-to-self Enabled
Roaming Aggressiveness 3.Medium
Throughput Enhancement Disabled
Transmit Power 5. Highest
Wireless Mode 6. 802.11a/b/g

Driver details:
NETw5s64.sys
vwifibus.sys
NETw5c64.dll
NETw564.dll

Modem Settings:
ESSID Yay1n1 Etkin   Etkin Deil  
Kablosuz Mod  Karma(11b+11g)Sadece 11gSadece 11b  
Kanal  Auto12345678910111213  
Security: Only WPA

Encryption Method: TKIP  
Auth. Tech.  PSK  

Those processes consumed 5 hours of my life and it worths a 10000 points imho. I need Doctor House:)

Best regards....