I've been having wireless problems on my Windows XP laptop (Thinkpad
T40) since two days ago.  It happened out of the blue - the internet
would just not work for me, even though other people on my network are
fine.  I opened up the property and saw that my machine is sending
packets (about 10-20 per second), and barely receiving.

What's really frustrating is that after a minute or two, I would be
back on, and then after a minute, off again.  Now I'm connected to our
router via physical cable, and I have no problems at all.  And this
has happend in both my office and at home.

First I thought I had a spyware or virus that's taking up the
bandwidth, but I think that would've screwed up my LAN connection as
well.

I think there might be something wrong with either my machine (but
then again, this morning I was on the internet, using the wireless
connection, for almost an hour till it broke), or maybe my Windows
software is corrupted?  The machine is almost four years old.  I have
a lot of work on the laptop and it'd be a major pain to reinstall
everything (I have checked what background processes are running via
the task manager, and I'm pretty sure there's no fishy programs
running).

Thanks so much.

http://64.233.161.104/search?q=cache:9BphVU-zFP4J:www.mobileplanet.com/forumthread.asp%3Fcode%3D110551%26thread%3D125+thinkpad+t40+wireless+probles&hl=en&gl=us&ct=clnk&cd=1

http://64.233.161.104/search?q=cache:qJAIrkDW3kkJ:www.velocityreviews.com/forums/t4879-cisco-1100-ap-and-ibm-thinkpad-t40-problem.html+thinkpad+t40+wireless+stopping&hl=en&gl=us&ct=clnk&cd=3

http://ask.metafilter.com/mefi/35313

There seems no problem with your hardware. I think there may be some
reasons as follows:
   1.there are some interferences caused by your electric furnitures
which can eradiate electromagnetic waves, such as micro-wave
ovens,wireless phones. If they are just 2~4 metres away from your
wireless router or T40.
   2.there are too much users in the same WLan( wireless lan) as you.
Especially some of them are downloading at very high speeds.
   3. When you open your WLan client, you often can find three or four
other WLan Base Stations(BS)  existing in a tiny frequency section. In
other words, the frequencies of  Wlan Base stations are very close to
each other.  Because the default frequency of the Wlan BS usualy set
to 2437MHz according to the 802.11b or 802.11g standards, they might
interfere each other .

  My advice:
1. check suspicious electric furnitures around your notebook or wireless router.
2.choose a Wlan with fewer users, maybe you have to switch one to
another to compare them.
3.change the default frequency of your Wlan.

 I hope I can help you, Good Luck