Poor WIFI on my 24"iMac

Hi, wifi on my iMac is terrible.
Basically it works on and off and often at very low speed.
While the iMac is not working I have no problem connecting with my PC and iPhone.
The wifi station is close by the iMac and there is a good connection.
I have tried changing the security settings on the wifi.
I have installed latest updates for my iMac.
If I use LAN the iMac has no problems.
It is not an option to go back to previous versions of Mac OS (which I have seen suggested in some posts here)
I notice that quite a few people is struggling with similar problems, but have no really been able to find a good solution to the problem.
Any suggestions (in a language that a non-IT person understands ;)?
Thanks
Kris

I have struggled for months with a pitiful wireless connection with my iMac 24". A combination of upgrading to a new DSL modem/router and installing snow leopard had made my internet connection absolutely terrible, very slow and with very frequent losses of connectivity.
I tried every suggestion I found on this forum, from the latest software downloads to changing all possible settings in the airport preferences. I also moved the computer closer to the router but nothing changed. The other mac in the house connected to the router via ethernet, instead, was working fine.
Finally, yesterday I bought a Netgear 85 Mbps Powerline Network Adapter Kit and, with my computer connected via ethernet, everything works like a charm.
This kit comes with 2 adapters: you plug one in the router and the other in a electrical plug near your computer and connect the two via ethernet. It costs about $90 but it is sooooo worthed.
The only thing you have to make sure is that the 2 outlets are electrically connected.
It is too bad that Apple's wifi technology is way, way below the otherwise high standard typical of their products.
I hope this helps.
Good luck!

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Dear anihilist
Welcome in Lenovo forums
Please try to update the driver using the below link
Link : http://support.lenovo.com/en_US/downloads/detail.page?DocID=DS031976
Please let me know once you done
Thanks
Alaa
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http://support.apple.com/kb/HT2712
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