How to

Cache memory is a small, very fast memory built into your CPU that holds data the processor needs next. L1, L2 and L3 explained, how to check it and clear caches.

Microsoft Defender Offline scan on Windows 11/10: when to reboot into it, how to start it, BitLocker and WinRE checks, and where to read the results.

Install classic Outlook on Windows 11 from Microsoft’s download page, Microsoft 365 or the toggle in new Outlook, stop auto-switching, and fix it when it won’t open.

Install Windows 11 Insider Preview builds from Settings > Windows Update > Windows Insider Program, or from an Insider ISO. Channels, removal and fixes included.

Web Companion is a Lavasoft browser add-on app that Microsoft Defender flags as a potentially unwanted app. Learn what it does and how to remove it fully.

Create a guest account on Windows 11 as a local standard user from Settings, Command Prompt or PowerShell, then limit, use, disable or remove it safely.

Steam redeem code steps: activate a game key with + Add a Game in the Steam client, or add a gift card or wallet code on the Steam website. Plus error fixes.

idp.generic is a generic antivirus detection, often a false positive. Learn how to check it on Windows 10, remove it from quarantine, or report a safe file.

Microsoft Entra is Microsoft’s identity and network access product family, and Entra ID is the new name for Azure AD (AAD). Products, licenses and admin tools.

New Outlook vs old Outlook: new Outlook adds snooze, pin, undo send and faster updates, while classic Outlook keeps COM add-ins, VBA macros and full PST support.

Open a Numbers file on a Windows PC free in Numbers for iCloud, convert it to Excel, or use LibreOffice Calc. All 7 ways, plus fixes when Excel refuses it.

Send text messages from a PC with Phone Link for Android or iPhone, or Google Messages for web in any browser. Setup steps, limits and fixes for missing texts.