We just rolled out about 15 of Windows 7 notebooks and I have had 3 instances of what I believe is the same issue. People reported one day they could not print as there were no printers listed anymore. Indeed, print spooler services was not running, see below for the eventlog .. well, event:

Faulting application name: spoolsv.exe, version: 6.1.7600.16385, time stamp: 0x4a5bced7
Faulting module name: nippnt.dll, version:, time stamp: 0x4bbd6a10
Exception code: 0xc00000fd
Fault offset: 0x000151b7
Faulting process id: 0x744
Faulting application start time: 0x01cb053a4c920c32
Faulting application path: C:\Windows\System32\spoolsv.exe
Faulting module path: C:\Windows\System32\nippnt.dll
Report Id: f4b1a9e9-712d-11df-8f15-c417fef19dae

This batch has v5.40 installed. All of those who reported the issue had some extra printers installed - local printers that's it. I am yet to confirm if there is a pattern as I am yet to see one with only network printer(s) installed ( which they all have by default ).

We also have a batch of about 200 Windows 7 notebooks with iPrint v.532 and I have never seen this issue on those. I am thinking of rolling back to v.532 if it becomes a real problem, would like to avoid this as I believe printer profiles in Win 7 are only supported in 540 ( was going to start using them soon ).