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Sounds like a malware and/or virus infection. Run the virus scanner, adaware or spybot, scandisk and defrag in SAFE MODE.
Let me know how you make out.
Also, check the device manager for problems, and check if your video adapter driver needs updating
Usb ports can be difficult at times, as they get stuck in a cycle from last peripheral connected.
The best thing to do is go to right click on My computer>properties>hardware tab>device manager and in the harware list will be your usb controllers.
right click on them individually and select uninstal, then restart your notebook and they will re install themselves, that should clear that.
Next the sound, if you are unable to change anything, then the driver is more than likely corrupt.
Again follow above proceedure and look down list for sound, video & game controllers, click tht'+' to Realtek drivers if thats your sound chip and right click and uninstall.
Restart your notebook again and again the sound driver should re install itself.
If you still have a driver problem go to acer site as the drivers may need updating.