(Note that all these problems started at a seemingly random time while I was using the computer - I didn't even need to restart to see all these programs complaining in strange ways)
Com+ System Application service won't start:
Looking at the dependencies for any service also fails:---------------------------
Services
---------------------------
Could not start the COM+ System Application service on Local Computer.
Error 1067: The process terminated unexpectedly.
---------------------------
OK
---------------------------
Wlcomm.exe, under debugger, dies with error code 0x80070057 (though I'm not sure if this is just because it needs arguments).---------------------------
Service Dependencies
---------------------------
Interface: Class not registered
---------------------------
OK
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Even QTTask won't run, and it dies without error code.
I'm not sure what else is and isn't broken, but if anyone can help with this problem I'd be really grateful.
[Just for fun, note that it's mostly the programs that have always seemed the most flashy and bloated in my mind (itunes, quicktime, wlm) that have died.]