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Ifthe cell phone battery is more than 3 - 4 years old then the battery could be wornout. Rechargeable batteries have a finite number of charge and discharge cyclesand will lose their charge capacity over time, i.e. won't charge to 100% andgradually the charge reduces until the battery won't charge up atall.
ORThe battery shows a 100% charge but when the adapter is disconnected the batterydrops off to zero capacity in a very short time.
Ifthe battery drops to an unacceptable charge level then the battery needs to bereplaced.
Cellular device viruses are very rare. Should you find an 'anti-virus' in a marketplace, I would simply avoid them. They are not necessary and many of them will populate with false alarms requesting you spend money to protect your device.
As for themes, your phone is equipped with Samsung's TouchWiz user interface. You can move your icons and applications around, and you may change your background, but other than that your customization options are limited.
You may try and disable TouchWiz for a different look by going to Settings, then Applications, select the Running Applications option and find TWLauncher and force close it. This is supposed to send the phone back to the stock Android launcher; On some devices TouchWiz will restart immediately with no visible effect. Stopping this process will not cause damage to your phone, nor should it cause a malfunction of any sort.
You can also check the marketplace for Launchers, such as ADW Launcher, which is much more customizable than TouchWiz.
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