This could be a simple matter of firmware for the USB wireless 
adapters.  Have you tried removing the USB adapters for a few seconds 
after linux has been shutdown, then booting windows?  You could also 
unplug them while windows is running and then replug to load windows' 
copy of the firmware.  I've had adapters that refuse to work between the 
2 OSes because of mismatched driver/firmware combinations without 
removing power from the adapter.  I imagine there is some flag or device 
ID change that occurs once the firmware is properly loaded, causing 
subsequent loads to be ignored.  I've seen this with JTAG programmers as 
well.  You may be experiencing this, only in a more subtle manner.

-Mark

Rachid Ayad wrote:
>  Sorry i forgot to say even when only windows is running the network 
> is also stopping priodically. Before installing linux as double boot I 
> shrinked the NTFS parttion to free space for linux so ....
> The wireless source is in a linux box running linux enterprize.
>
>  Thank you, Rachid
>
>
> On Thu, 13 Jan 2011, Rachid Ayad wrote:
>
>> Justly I just arrived at a Lab that has many wondows boxes and I need 
>> linux for my work so I installed SL Linux 5.5 as double boot with 
>> VISTA and in all machines with double boot windows-linux the network 
>> is lost periodically. All the PCs have USB wireless probe. I am new 
>> in the Lab but at the time I am writing this email i did not check 
>> yet the wrieless source.
>>
>> Thank you, rachid.
>>
>>
>> On Thu, 13 Jan 2011, Francesco Alfano wrote:
>>
>>> Hello,
>>> I have a problem with the (exported) sharing of network resources.
>>> Initially i've used a sever with RedHat 7.3 kernel 2.4 now i've 
>>> installed Scientific Linux 5.5 with kernel 2.6.18-194.32.1.el5PAE 
>>> with Samba version 3.0.33-3.29.el5_5.1.
>>> The problem is that I lose the network connection periodically, 
>>> about 10 minutes!
>>>
>>> I initially thought the problem was caused by a misconfiguration of 
>>> samba version of sl, that I installed on a client machine with 
>>> windows 2000 the "Microsoft Windows for Unix" in order to use nfs 
>>> connection exported from linux server, but the problema arise equally.
>>>
>>> It's a serious problem for me because the disconnection of a mapped 
>>> drive on w2k (connected via smb or nfs) is causing the crash of a 
>>> basic application that tries to detect the presence every second of 
>>> a new file in shared resource.
>>>
>>> This problem was not present with the older version of linux !!!
>>>
>>>
>>> Thanks in advance for your help.
>>>
>>> -- 
>>> -- 
>>> Best Regards
>>> Francesco Alfano
>>>
>>


-- 
Mr. Mark V. Stodola
Digital Systems Engineer

National Electrostatics Corp.
P.O. Box 620310
Middleton, WI 53562-0310 USA
Phone: (608) 831-7600
Fax: (608) 831-9591