When is it slow?
Startup, web browsing, opening files, gaming and everything-at-once slowdowns suggest different investigation paths.
How full is the storage?
Very limited free space can make updates and normal operation harder. Capacity alone does not prove a failing drive, but it is useful context.
What appears in the background?
Updates, sync tools, security scans and startup applications can create temporary load. Avoid deleting or disabling things at random.
Does it freeze, crash or make unusual sounds?
Those details matter. A performance complaint with instability or abnormal drive noise may need a different priority than ordinary slowness.
What changed recently?
New software, updates, a full drive, overheating, physical damage or a new peripheral can narrow the timeline.
Do not promise the diagnosis from a message
A message can frame the next step. It cannot prove storage health, malware, memory failure or a repair outcome.