My machine doesn't recognize some USB flash drives

abbasi

TS Booster
Hello all,
My friend's Windows 7 x64 ultimate machine recognizes some USB flash drives but not some other ones. The types of all are USB2 and also all drivers are installed (device manager). I don't know what is the problem. Is there any idea please?
 
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abbasi

TS Booster
Thank you Cob,
I read the link (http://timesofindia.indiatimes.com/tech/how-to/PC-not-recognizing-your-USB-drive-Heres-what-to-do/articleshow/24697214.cms), but no success.
The situation is this way:
I think the problem is to do with the drivers because when I plug that USB flash into my machine (Win 7 x86 Ultimate), it can read it properly. And on the my friend's, first there isn't any new disk in disk management and also there isn't any yellow exclamation in device manager so I can't install/update it.

Also I read that link. I found something,
In the Universal Serial Bus controllers (device manager), I found the name of that USB flash drive. On the properties of it and in the Device status there is the following message:
No divers are installed for this device.
Now how to install that driver please?
And this is an image from that flash drive (silicon-Power 4g).
 

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