Help! My Macbook Pro does not read my USB Modem.

I have a USB Modem with Claro (a peruvian company) and my computer use to read it just fine but now does not. A friend connected another USB Modem from another compàny (Movistar) and also a USB cable for his projector and now all of a sudden my macbook does nothing when I connect my Claro USB Modem. When I plugged my claro usb into my computer, a program use to start up that would allow me to click ¨connect´ and connect to the internet but now nothing starts up. I thought that maybe the movistar modem or projector downloaded programsthat prevented my macbook for reading my claro modem so I completely deleted those programs, system files and all. I even completely deleted the claro program hoping that it would automatically download once I connected the claro usb like it did the first time. Please help! I volunteer in the middle of nowhere and internet is kinda important.

If http://support.apple.com/kb/HT1411 Apple Portables: Resetting the System Management Controller (SMC), http://support.apple.com/kb/HT1379 Resetting your Mac's PRAM and NVRAM, http://support.apple.com/kb/PH11243 OS X Mountain Lion: Reset your computer’s PRAM do not work, I would return the modem back to Claro. Find one that will "just work" on a Mac. Have you considered Apple's modems?

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