WiFi system tray icon always shows 5 bars when it shouldn't

The house has 2 laptops connected to a mobile hotspot.
Both connect fine to the internet. One is a Lenova (Win7 64bit).
When it connects, its wifi shows 2 or 3 bars (for this house,
3 bars is high). The second computer is a Toshiba that I got
2 years ago and it has always shown 5 bars. Because it was the
first Win 7 machine in the house I assumed that was the way it
was supposed to be, until we got the Lenova.
I have searched the Net for some answer, but found none. I have
cleared the Tray Notification Cache with CCleaner but that did
nothing. I ran a program that someone said would fix missing
tray icons and that did nothing.
I have considered swapping that dll file with the icons in it
(forgot the name right now) that I assume both the Toshiba and
Lenova have. Since they both have Windows 7 Home Premium 64bit SP1,
I would think the file would be the same. I am just not sure
what would happen.

For other information, the wifi icon will show other 'phases',
When I say phases, I mean: not connected, connecting, can't connect and
connected, but it will not show the separate bars.

I find this a little odd and a little maddening that the all powerful google can't help me!

Thanks.

I updated the Realtek and Microsoft Wireless adapters and the problem still exists.
Just a note, I have no trouble connecting. Why would I need to update update a Wifi driver? This seems to be more of a Windows issue. I am not trying to get ahead of the troubleshooting game, I am just trying to find out what is wrong or head it off at the 'pass'.

As I said in the OP, the Lenova shows between 2 and 3. The Toshiba has always showed five even in the basement when it should have shown just one. If I had regular broadband, I would not be complaining, but I would like to see how many bars I have. It is especially important that I never caught it when I first got it. I might have returned the machine for a replacement. As it is, I am just looking for a fix.

Anyway, is it possibly something to do with the set of icons or to do with the registry?

I am using a 3G cellphone to get a connection to the internet. The phone never gets more than 3 bars and sometimes only gets one bar. The Toshiba Laptop still shows 5 bars with the phone right next to it while the Lenova laptop will show 2 or 3 bars depending when the phone is next to it. The Toshiba has ALWAYS shown 5 bars as if it were the only icon it could show, but the Lenova has show varied bars, making me believe that there is something up with the icons not with the speed.