You might try cleaning some of your extra or dead files on the computer. Cleaning out or deleting the Temporary Internet Files in your computer system will definitely clear a great deal of space and allow your computer greater mental acuity. Clearing out the History will help as well. When the cursor changes to a double arrow, click and hold the left mouse button. Your task bar should be back.
Viruses come in all shapes and sizes.
Your best bet for virus protection is using one of the utilities provided by such companies as Norton or McAfee. Install these in your system and let them do their best to keep your computer healthy. Like human viruses and bacteria, each virus or worm is different in nature, so there is no set method to clear the infection. For more information about viruses, read the Preventive Healthcare section. If you hear the various sounds made by Windows, then chances are the music will play also.