Installer crash

Updating to build 32:

Problem signature:
  Problem Event Name:    BEX
  Application Name:    tcmd.exe
  Application Version:
  Application Timestamp:    514abda0
  Fault Module Name:    tcmd.exe
  Fault Module Version:
  Fault Module Timestamp:    514abda0
  Exception Offset:    000af424
  Exception Code:    c0000417
  Exception Data:    00000000
  OS Version:    6.1.7601.
  Locale ID:    1033
  Additional Information 1:    6af9
  Additional Information 2:    6af9bc8525380c1ccc472b272fcb3667
  Additional Information 3:    a089
  Additional Information 4:    a08916b7d639075a0d723d93cf32ac36
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I brute-force downloaded the B31 installer, ran it without difficulty - WinXP32 SP3. However, it left a whole slew of files in a JPsoft subdirectory of %tmp. All but tcmd.msi were identical to the installed files. It also created shortcut files in both the Quick Launch and the Start Menu directories, even though I carefully unmarked them on the appropriate page. Emptying the while %tmp tree had no bad effects.