Started poking around the Windows partition from Linux. Whole mess of pretty randomly named files under c:\\Program Files, either 10240 or 19270 bytes in size. Got suspicious and ran a Klez disinfectant. 18,388 files scanned, 534 deleted, 165 repaired (most of which I'll delete by hand anyhow). Major case of the Klez. Makes me wonder what else is on here.