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how to fix 'the security certificate presented by this website was not issued by a trusted certificate authority' on win

CheckthedateandtimeonyourPCandensureautomaticsettingsareenabled,asincorrectdatescaninvalidateSSLcertificates.2.ClearbrowsercacheandSSLstateinMicrosoftEdgethroughprivacysettingsandresetnetworksettingstodefault.3.VerifyTrustedRootCertificationAuthoriti

Jul 31, 2025 am 07:53 AM

security certificate 不受信任

Windows key has stopped working

1. First check whether the Windows key is physically damaged or stuck, clean and test the keys; 2. Confirm whether the WinLock key is enabled or disabled by third-party software, and try to turn off the relevant functions; 3. Use the on-screen keyboard or test the key in the BIOS to determine whether it is a hardware problem; 4. Update or reinstall the keyboard driver; 5. Check the NoWinKeys settings in the Group Policy or the registry, and if the value is 1, change it to 0; 6. Run the Windows built-in keyboard troubleshooting tool; 7. Connect to the external keyboard test to confirm whether the built-in keyboard is malfunctioning; 8. Restart the Windows Explorer process to fix the system shell problem. Usually the problem stems from the settings being changed or software conflicts, if all methods are invalid,

Jul 31, 2025 am 07:53 AM

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how to fix search indexing was turned off on my win pc

StartbyenablingtheWindowsSearchserviceviaservices.msc,settingittoAutomaticandstartingitmanuallyifneeded.2.RebuildthesearchindexthroughIndexingOptionsinAdvancedsearchsettingstofixcorruption.3.Runthebuilt-inSearchandIndexingTroubleshootertodetectcommon

Jul 31, 2025 am 07:52 AM

The number pad Enter key is not working

EnsureNumLockisenabled,asitactivatesthenumberpad;onsomelaptops,pressFn NumLock.2.TestthenumpadEnterkeyindifferentapplicationstoruleoutsoftware-specificissues.3.VerifythecorrectkeyboardlayoutandlanguagesettingsinWindows,removingduplicates.4.Testthekey

Jul 31, 2025 am 07:47 AM

my win pc microsoft office keeps asking to activate

CheckOfficelicensestatusinFile>Accounttoconfirmactivationandaccounttype.2.SigninwiththecorrectMicrosoftorwork/schoolaccounttolinkthelicense.3.RepairOfficeusingQuickorOnlineRepairviaSettings>Apps>Microsoft365>Modify.4.Removeconflictinginst

Jul 31, 2025 am 07:41 AM

win 10 camera not working error code 0xA00F4244

First check the camera permission settings to ensure that "Allow apps on this device to access the camera" and "Allow desktop apps to access the camera" are turned on; then update or reinstall the camera driver, and you can update or download the latest driver from the official website through the Device Manager; then reset the camera application, find the camera application in the settings and click "Reset", and reinstall it if necessary through the PowerShell command; check whether system services such as CameraFrameServer are started, set it to automatic and start manually; run the camera troubleshooting tool that comes with Windows for automatic repair; finally troubleshoot the BIOS/UEFI settings and confirm that the integrated camera is not disabled. Follow the above steps one by one, most of the 0x caused by software or settings

Jul 31, 2025 am 07:39 AM

how to fix win update error 0x80072ee7

First check and ensure that the network connection is normal, 1. Restart the router or switch to a wired connection to stabilize the network; 2. Run the Windows Update Troubleshooter tool to automatically fix common problems; 3. Run the command prompt as an administrator, stop the wuauserv, cryptSvc, bits, msserver services, rename the SoftwareDistribution and Catroot2 folders, and restart the service to reset the update components; 4. Turn off the proxy server in the settings and change the DNS to 8.8.8.8 and 8.8.4.4; 5. Temporarily disable third-party firewalls or antivirus software; 6. Ensure that the system time is automatically synchronized and the time zone is correct; if it still fails, run sfc

Jul 31, 2025 am 07:38 AM

how to fix a corrupted user profile by creating a new one on a win pc

CreateanewadministratoraccountviaSettingsorCommandPromptusingnetusercommandsiflockedout.2.Logintothenewadminaccounttoensureafunctionalenvironment.3.Copypersonalfilesfromtheoldprofile(e.g.,Desktop,Documents)tothenewprofile,takingownershipifaccessisden

Jul 31, 2025 am 07:36 AM

repair user profile

Excel cannot open the file because the file format or file extension is not valid

First, confirm whether the file extension matches the actual format. If it does not match, correct the extension or import it in the correct way; 1. Check and display the file extension to ensure that it is valid formats such as .xlsx or .xls; 2. Open the file with Notepad to view the content and determine whether it is CSV, HTML or garbled code; 3. If it is CSV or text format, open it through Excel's "Data" → "Import from Text/CSV" function; 4. Try to use Excel's "Open and Fix" function to restore abnormal files; 5. Re-download or export files from the source system to avoid incomplete transmission; 6. Test opening on other devices to eliminate local environment problems; as long as you clarify the real format of the file and take corresponding actions, you can solve the problem that Excel cannot open.

Jul 31, 2025 am 07:36 AM

how to fix win error code 0x8007007e 'the specified module could not be found'

Run SFC and DISM to repair system files; 2. Reinstall VisualC redistributable components; 3. Use DependencyWalker to check missing DLLs; 4. Update Windows system; 5. Reinstall the problematic application; 6. Check program compatibility settings; 7. Perform a full-disk anti-virus scan. First, you should run the sfc/scannow and DISM commands to repair the system files, and then reinstall the x86 and x64 versions of Microsoft VisualC Redistributable, while ensuring that the Windows system has been updated to the latest state. If the problem still exists, you can try using DependencyWalker.

Jul 31, 2025 am 07:35 AM