Finding your BitLocker recovery key in Windows - Microsoft Support
If you are unable to locate the BitLocker recovery key and can't revert any configuration change that might have caused it to be required, you’ll need to reset your device using one of the Windows recovery options. Resetting your device will remove all of your files.
Turn on device encryption - Microsoft Support
Open Device encryption in Settings. If Device encryption is turned off, turn it On. Turn on standard BitLocker encryption Sign in to your Windows device with an administrator account (you may have to sign out and back in to switch accounts). For more info, see Create a local or administrator account in Windows.
Remove malware from your Windows PC - Microsoft Support
Learn how to remove malware from your PC. Use Microsoft Defender in Windows 10 or Windows 11 to scan your PC for malware, viruses, or other threats.
Applies To: OneDrive (home or personal), OneDrive for Windows
Activate Windows - Microsoft Support
Methods of Windows activation Depending on how you got your copy of Windows 11, you'll need either a digital license or a 25-character product key to activate it. Without one of these, you won't be able to activate your device.
Enable TPM 2.0 on your PC - Microsoft Support
If it is less than 2.0, your device does not meet the Windows 11 requirements. Option 2: Use the Microsoft Management Console. Press [ Windows Key] + R or select Start > Run. Type “tpm.msc” (do not use quotation marks) and choose OK. If you see a message saying a “Compatible TPM cannot be found,” your PC may have a TPM that is disabled.
Use the System File Checker tool to repair missing or corrupted system ...
At the command prompt, type the following command, and then press ENTER: sfc /scannow The sfc /scannow command will scan all protected system files, and replace corrupted files with a cached copy that is located in a compressed folder at %WinDir% \System32\dllcache. The %WinDir% placeholder represents the Windows operating system folder.
"Access Denied" or other errors when you access or work with files and ...
If the Encrypt contents to secure data check box is selected, you have to have the certificate that was used to encrypt the file or folder to be able to open it. In this situation, you should obtain the certificate from the person who created or encrypted the file or folder, or have that person decrypt the file or folder.
Add an exclusion to Windows Security - Microsoft Support
If you trust a file, file type, folder, or a process that Windows Security has detected as malicious, you can stop Windows Security from alerting you or blocking the program by adding the file to the exclusions list.
Change your PIN when you’re already signed in to your device
To change your PIN when you're already signed in: Make sure you're connected to the internet, so the change syncs to your Microsoft account. Select Start > Settings > Accounts > Sign-in options. Select PIN (Windows Hello) > Change PIN and then follow the instructions. You will need to know and enter your old PIN in order to change to a new one.
Delete and manage cookies - Microsoft Support
To delete cookies. In Internet Explorer, select the Tools button, point to Safety, and then select Delete browsing history. Select the Cookies and website data check box, and then select Delete.