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Try checking the signal strength then run the scan again. Checking the DTV signal strength
You can check the DTV signal strength to determine if you need to adjust your antenna or digital cable input. The higher the signal strength, the less likely you are to experience picture degradation.To check the DTV signal strength:
1.Press MENU. The on-screen menu opens.
2.Press < or > to highlight Channel, then press v. The Channel menu opens. The DTV signal strength is shown at the bottom of the menu.
just get into safe mode by pressing f8 , then click the command prompt from the start menu or if you dont get the start menu press ctrl+alt+del key to get the task manager and go to file and click new task run the command prompt from there. Then in the command prompt type sfc scannow it will ask for the win xp cd for xp and for vista or 7 it automatically scans and fixes the system file errors.Let me know if still the errors are there.
All US TV signals are now digital, but most TV tuners are like our old TVs - analog. Are you sure your tuner is a DTV tuner? If not, you will need to replace it or get a DTV converter. A DTV converter will not let your computer pick the channel and time though.
But one footnote. Broadcast digital TV is often not the same a cable digital TV. If you get a cable digital signal it is encrypted to the actual serial number of the receiving box. No broadcast DTV converter can do this. This is how the cable company now controls the number of receivers and one has to pay for EVERY set.
Try to boot Vista into Safe Mode. Tap the F8 Key right after you turn on the computer until you get the Advanced Boot Up Menu
and use the keyboard arrow keys to select Safe Mode. The next screen may ask you to select your operating systm. Select Vista, not the Recovery Console.
Does your task bar and icons appear in safe mode? If so, it might be one of your start up programs that is failing and causing explorer.exe to fail during normal boot-up into Windows and not allowing your taskbar and icons to appear. Click Start and type in msconfig and hit enter then click the Start Up tab and look at all the programs that start up when Vista is starting up. Do Not uncheck anything in the list that you do not recognize as you may uncheck drivers or Vista starting programs that you computer needs to start up Vista properly. Google anything you don't recognize and uncheck any Start Up programs you do not need to start when Vista boots up, like Quicktime player or Adobe Reader for example. (This would also help your boot up time into Vista)
Sounds like explorer.exe crashed. Try opening up the Task Manager again, and Click File > New Task and type in explorer.exe. See if the task bar and your desktop icons appear.
If they appear for a brief moment then disappear again, the Windows explorer.exe is corrupted. Explorer.exe will try to start and then fail again. You may need to use System Restore to bring your computer back to a date and time when the computer was working properly, before the Vista update.
Well, your problem seems to be due to a virus attack. Certain virus disable your task manager. To solve this, scan your computer with a good antivirus software and remove the virus. But in most cases you won't be able to restore the task manager with the antivirus application. So the best method is to backup your documents on the the drive where OS is installed and reinstall your OS.