Wifi Working OK, MBP after 10.4.8 update SLOW!

Hi all!
Right after I upgraded to 10.4.8 the Airport connectiom on my MBP is really slow. I used to get 700kbps speeds, but know i´m at 45kbps!!!
I tried the "delete preferences" tip found on these boards, but it did not work in my user account.
I then created a new user account, and Airport connected at full speed. It has to be some software issue, so i tried to delete all prefs I could find in my original account regarding Airport or network, but it still hasn´t improve.
I must say i have never had any issues with Airport on my MBP, it has always worked flawlessy until right after the update.
Any ideas??? thank you.

two ideas that have already been mentioned:
- do you use coconut wifi? quit it / delete it al a startup item (preferences -> user -> select yourself -> startup items (that's how it might be called in English^^)
- try switching the router's channel (might be helpfull to use a cable-conncetion while doing that): load your router's setuppage (usually the component's name such as fritz.box or (in my case) ssx553, or try your IP and replace the final digit with a 1) than go to wifi, channels. Switching it to "auto" helped in my case, a friend of mine had good experiences with channel 11.
Hope this will help (I am NO computer expert and pretty new to the mac^^)
MacBook Pro     2GHz Core Duo - 2 GB 667 MHz DDR2 SDRAM

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