This happens only when the computer has been on for a number of hours. When I try to open most programs, a red sign comes on saying I do not have "correct permissions." Then when I try to reboot or to shut off, the computer gets stuck in one of the phases, and I have to push and hold the start button to force a shutoff. When I turn it on again (even if immediately), a screen says the computer didn't shut down normally. But then I tell it to "open windows normally" and it does, and everything is fine..all programs work, shutoff works, no problems....for a few hours. This happens every day, even when the programs which I have been using during the day are different from those of the preceding day. Help.
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you have access to the computer when it's turned on, you could try one
of those programs that remove the password from the BIOS, by
invalidating its memory. However, it might happen you don't have one
of those programs when you have access to the computer, so you'd better
learn how to do manually what they do. You can reset the BIOS to its
default values using the MS-DOS tool DEBUG (type DEBUG at the command
prompt. You'd better do it in pure MS-DOS mode, not from a MS-DOS shell
window in Windows). Once you are in the debug environment enter the
following commands: AMI/AWARD BIOS O 70 17 O 71 17 Q PHOENIX
BIOS O 70 FF O 71 17 Q GENERIC Invalidates CMOS RAM. Should
work on all AT motherboards (XT motherboards don't have CMOS) O
70 2E O 71 FF Q Note that the first letter is a "O" not the
number "0". The numbers which follow are two bytes in hex format.
Assuming that you are correct about being malware free, my next best guess is that the machine is overheating. Overheating can cause a PC to slow down. A simple way to help with an overheating PC is to clean all dust from it, especially dust stuck in the fans and on the CPU heatsink.
I don't think the loopback IP can be disabled. Some suggestions: Try looking in the Registry for the Windows Media Encoder settings. (uninstalling doesn't necessarily delete the registry settings) Make sure the program is running with the correct permissions (Run-As Administrator, for instance). Check your Windows firewall (or other security programs you have) to make sure it's not preventing it from working properly.