Desktops: USB Ports not working - HELPPPPPP!

USB Ports not working - HELPPPPPP!

From some days ago, I am having big problems with my USB ports. I think, but I am not shure that all begun when I was trying to turn on my web camera (Logitech QuickCam Communicate stx), the computer (which is an Emachines T5026 specifications at the bottom of the page) didn't know that the camera was connected, same thing happened today when trying to print a document, the printer (Cannon MP750) was offline and the USB port didn't detected the printer. At the same time, my mouse (Microsoft Intellimouse Explorer 2.0) and keyboard (Microsoft Digital Media Pro Keyboard) are both connected in other 2 USB ports at the back of my computer (4 in the back, and 3 in the front) and they are working properly. When I connect my iPod Shuffle in the USB port nothing happens and although, if I go to my computer the ipod is listed there, iTunes did not recognize as if there is an ipod connected to the computer. What is stranger too, is that "Safely remove hardware" icon dissapeared from the task bar and never work when I connect something. Maybe that's the reason but I am unable to know. I don't know how to install new drivers for my USB ports and nor how to make work the Device Manager which is not working neither, it is in blank.
In the Taskbar and Star Menu Properties I already tryed to customize the properties of the icon to allways show in the taskbar but it didn't work.


Any help will be very much appreciated.

Specifications:
Intel 82801FBICH6 - Enhanced USB2 Controller
CPU: Intel® Pentium® 4 Processor 519
Operates at 3.06GHz
1MB L2 cache and 533MHz FSB
Operating System: Microsoft® Windows® XP Home Edition
Chipset: Intel 915GV chipset
Memory: 512MB Dual Channel DDR
Expandable to 4GB
Hard Drive: 160GB Serial ATA 7200rpm, 8MB cache
Optical Drives: DVD±RW, 16x Multi-Format double layer
CD-ROM drive - 48x max write
Media Reader: 8-in-1 digital media manager
Video: Intel® Graphics Media Accelerator 900 w/DirectX 9 support
Up to 224MB shared video memory
Sound: Intel® High Definition 6-channel audio (5.1)
Network: Intel® PRO 10/100Mbps integrated Ethernet
Modem: 56K ITU v.92-ready Fax/Modem
Peripherals: Premium multimedia keyboard, 2-button wheel mouse, amplified stereo speakers
Ports/Other: 7 USB (1 in Media Manager, 2 in front, 4 in back), 3 IEEE 1394 Firewire (2 in front, 1 in back), 1 VGA external connector, 1 serial, 1 parallel, 2 PS/2, 5 audio (2 in front, 3 in back)