▦M.2 NVMe SSDTroubleshooting guide
A large copy to an NVMe SSD starts fast, then the transfer speed drops sharply partway and either stays low or keeps rising and falling
M.2 NVMe SSDs installed in Windows 11 / Windows 10 desktop or laptop PCs where copying or exporting files of tens of gigabytes or more, such as games or video, starts fast and then drops sharply partway through
▦Windows 11 power mode / energy saver, laptop maker power profiles (Lenovo Intelligent Cooling)Troubleshooting guide
The same work becomes slower the moment the power adapter is unplugged: lower frame rates, longer exports, sluggish response
Windows 11 (energy saver on 24H2 and later, battery saver on 24H1 and earlier and on Windows 10). Lenovo ThinkPad Intelligent Cooling user guides are used as the published example of the maker side
▦Windows 11 and Windows 10 PCs showing a connection notification after something is plugged into a USB-C port: a device, a dock, a display or a chargerTroubleshooting guide
A notification such as USB device functionality might be limited appears as soon as something is plugged into USB-C
Microsoft's support page carries steps for both Windows 11 and Windows 10, where the notification setting lives in different places. Eleven notifications are listed, and Microsoft does not state that the same explanation applies to wording that is not on the page. The page was read on 2026-09-21.
▦Windows 11 and Windows 10 PCs with memory integrity (core isolation) on in Windows Security, or where turning memory integrity on reports incompatible driversTroubleshooting guide
A notification says a driver can't load on this device, without naming the hardware
Microsoft's support pages cover the meaning of the notification, why memory integrity ends up turned off, and the four hardware security capability messages shown on the Device security page in Windows Security. No build-specific differences are given. The pages were read on 2026-09-21.
▦A Windows 11 or Windows 10 PC with a built-in display. On a setup with only an external monitor, the Windows brightness slider itself may not appearTroubleshooting guide
Brightness and contrast shift on their own when a video moves from a dark scene to a bright one
Microsoft's support page covers changing brightness manually, changing it automatically with the lighting conditions, changing it automatically with the displayed content (on some Windows 11 PCs), and the limits on night light. The content-based setting has three options. No build-specific differences are given. The page was read on 2026-09-21.
▦A Windows 11 or Windows 10 PC. The settings concerned are under Settings > Privacy & security > Search. On a Copilot+ PC, semantic indexing is additionally on by defaultTroubleshooting guide
A file does not appear in the results even when its name is typed exactly
Microsoft's support page covers the two indexing modes, Classic and Enhanced, the locations each covers by default, the per-file-type choice between indexing properties only and properties with content, a rule of thumb for index size, how long the first run takes, and semantic indexing and language handling on Copilot+ PCs. No build-specific differences are given. The page was read on 2026-09-21.
▦WindowsTroubleshooting guide
Windows asks to reconnect the backup drive
File History on Windows 11 / Windows 10, with an external or network destination
◫Microsoft OneDriveTroubleshooting guide
OneDrive reports that its storage is full
Personal and work or school OneDrive; Windows sync app and web
◫Google ChromeTroubleshooting guide
Chrome reports too many redirects
Google Chrome for desktop; a redirect error on a specific websiteERR_TOO_MANY_REDIRECTS
◫Classic Outlook for WindowsTroubleshooting guide
A message with a large attachment stays in Outbox
Classic Outlook for Windows (Microsoft 365 / Outlook 2024 / 2021) with the Send/Receive ribbon
◫Microsoft ExcelTroubleshooting guide
Excel says the file is locked by you or another user
Excel for Microsoft 365 / Excel 2024 / 2021 / Excel for the web; opening a shared workbook
◫Adobe AcrobatTroubleshooting guide
Opening a PDF displays A running instance of Acrobat has caused an error
Acrobat on WindowsA running instance of Acrobat has caused an error
◫Mozilla FirefoxTroubleshooting guide
Firefox says it is already running after exit
Firefox DesktopFirefox is already running but is not responding
◫Google ChromeTroubleshooting guide
A personal PC shows a managed notice
Chrome for Windows, macOS, and Linuxchrome://policy
◫Microsoft OneDriveTroubleshooting guide
Only blue-cloud files fail to open
OneDrive for Windows
◫Microsoft OneDriveTroubleshooting guide
0x8007016a appears on move, delete, or open
OneDrive for Windows0x8007016a
◫Classic Outlook for WindowsTroubleshooting guide
Outlook window cannot open
Outlook for Microsoft 365/2024/2021Cannot start Microsoft Outlook
◫Adobe Acrobat / Acrobat ReaderTroubleshooting guide
One PDF or every PDF fails to open
Current desktop releases on Windows