A very strange wired and wireless network issue

Hello,
I have never had any issue at all with my macbook (2008) until this week, I use it both for work and personal use.
Most of time, I'm used to be on customer site, so I use wired and wireless connections depending of the situation....
I have never had any issue at all with wifi neither ethernet connections during three years, until this week... and I can say this is the most strange thing I have ever seen....
Using wired or wireless connection, always the speed of network was really good, at home, many customers, etc never had any problem...
But this week I'm currently out of home, and the hotel where I'm staying I'm having very poor network rate....
Using wireless connection, the download speed is no more than 10kb.... and using ethernet I get less speed... but during the day I'm on customer site, using the ethernet connection and download speed is really good, more than 500k-800k....
I have already tried in the hotel few wifi connections (there are three) and differents wired connections (in diferent rooms) and the download speed is always the same, no more than 10kb...
During this afternoon, I could go into hotel's lab and could connect directly to the router using cable, same speed no more than 10kb....
The most strange thing is on their computers the download speed using wired connection is around 6Mb....
how is possible I'm getting no more than 10kb of download speed when the pc's at hotel using same wired connection gets 6Mb?
I have already deleted current network connections, execute onyx to clear everything, perform dhcp connection, tried manual ip etc, and always the results are the same...
I know there is no problem with the macbook, because it works pretty good at every location I've been... but until this week...
Sincerely I'm getting a little crazy here, I'll appreciate any help!!!
thanks in advance

I've seen something like this on my T400 when it was running Vista.  Now that I use Win 7 it's been OK. I rather doubt that your issue is the same but I'm tossing it out here just on the off chance.
Im my case, I had to downgrade my Intel 5300 card to a 5100 (as suggested by a Lenovo 2nd-tier tech) to get things working.
My symptoms were a little different.  Wifi was fine until I went back to a wired network.  After that, trying to use the same wifi AP as before would end up associated, but no internet access.  DHCP wasn't working.  The GUI "find" app didn't work as expected either.  Some APs showed up, and some didn't.
If I configured for automatic connection to my home AP it would try and fail.  Just rebooting at that point would again attempt an automatic connection that would succeed.
What I have noticed now that I run Win 7 is that Access Connections is completely useless.  Often the "finder" doesn't show an AP 3 feet away.  I didn't notice that this happened after a switch from wired, but maybe.
Are you using Access Connections?  If so, you might try uninstalling it.
Sorry I can't be of real help,
Z.
The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc.  The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ... GeezBlog
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