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If you first logon your PC with the microsoft account, you are the administrator. And if you are not belong to the admin group and no other admin accounts available, I am afraid it is not possible to add your only account into the admin group. Go to Control Panel\All Control Panel Items\User...

you could take a check with the built-in application called sound recorder: Record audio with Sound Recorder Or the recorder APP: Sound Recorder app for Windows: FAQ - Windows Help Or you may take some 3rd-party software. Regards

This should be related with the sound driver. Like Tripler suggested, update your sound driver would fix this issue. For sound issues, you can refer to the following article if any further issues: No sound in Windows - Windows Help Regards

you may follow the guide below to add a image folder, for the lock screen: Personalize your PC - Windows tutorial Regards

I suggest to uninstall the avast, and take use of Windows defender. Using Windows Defender - Windows Help Regards

That might be caused by the different file associations, you may check it with the right click as Ztruker suggested. Choose only the Doc t oopen with Office word and see if this will make any difference. Configuring file associations in Windows 8.1 - Michael Niehaus' Windows and Office...

Please upload the dump file, we need that file to analyze the BSOD result. Follow the instructions here: How to read the small memory dump file that is created by Windows if a crash occurs or you may follow the instructions here...

Right click on the D drive, then select properties, on the security tab, click on your current user account, then check if you have the right permissions configured in the lower box. If you have messed up with the permissions, using the following method: Diagnose and repair Windows File and...

You may have interests reading the two articles: How can I help protect my PC from viruses? - Windows Help From the author: Enhance the security of Windows 8.1 devices, using only built-in tools - Microsoft Press - Site Home - MSDN Blogs Basically, Windows Defender would be enough for us to...

You may take a try to use the power button to restart your computer three times. This will start the Windows Recovery Environment. See information here: Windows Startup Settings (including safe mode) - Windows Help At there take use of refresh again, before you download and do a clean install

Hi, That depends on what type of your computer is. Some newer machines may not support to install Windows 7, like surface Pro: Check the MS kb here: Windows 7 Setup hangs at "Starting Windows" on Surface Pro And if your machine is good to install Windows 7, it will still need to buy a key...