One bad driver should not be able to shut down every printer on the machine. Isolation mode is Windows' built-in way to fence that driver into its own process — here is how it works and when to use it.
If you have already found the driver that keeps crashing your spooler but cannot replace it today, this article is your safety net: what driver isolation is, the three modes in plain words, and the exact clicks in Print Management to contain the bad driver while life goes on.
The isolated driver crashed and its host process restarted — the spooler and every other printer never noticed. That is isolation doing its one job.
By default, many printer drivers run in a shared arrangement close to the spooler. When one driver crashes, it can take spoolsv.exe down — and every printer on the machine stops, even the perfectly healthy ones.
Driver isolation changes the blast radius. It loads a driver into a separate process, PrintIsolationHost.exe, so the driver's crash kills only that process. Windows restarts the host, that one printer hiccups, and everyone else keeps printing.
In Print Management each driver can be set to one of three modes:
printmanagement.msc, press Enter (on Windows Home, use Print Server Properties via Settings or printui /s /t2 for the driver list)Isolation earns its place in three situations. Diagnosis: you suspect a driver but cannot take the printer offline during office hours — isolate it and watch whether the spooler stabilises. Containment: the maker's current driver is buggy and a fixed version is weeks away. Mixed fleets: old printers with old drivers share a PC or print host with modern ones, and the old ones should not be allowed to hurt the new.
On a print server, isolating the shaky drivers is simply good hosting hygiene.
Honesty matters here: isolation does not fix the driver. That printer's own jobs can still fail or stall when its host process crashes and restarts. Print quality problems, wrong output and slow printing are untouched by isolation — those are driver bugs in a different shape.
There is also a small cost: isolated drivers use a little more memory and can be marginally slower to start a job. On any modern PC that cost is invisible; the stability is not. Treat isolation as a seatbelt, not a repair — and still chase the proper driver update.
The full print spooler repair — finding the real culprit and stopping the crash loop — is shown step by step in the video.
▶️ Watch Full VideoIt is the separate process Windows uses to run printer drivers that are set to Shared or Isolated isolation mode. Seeing it is normal and healthy — it means a driver crash will restart that process instead of killing the Print Spooler and every printer with it.
Slightly in theory, invisibly in practice on a modern PC. An isolated driver starts its job through its own host process, which adds a small overhead. In exchange, one faulty driver can no longer stop all printing on the machine — a trade every office should take.
Start with any driver you suspect of crashing the spooler, any very old driver kept for a legacy printer, and any driver whose maker has not updated it for your Windows version. Modern, current drivers from major brands are fine left on their default Shared setting.