Setup causes windows 7 explorer to crash

Windows 7 Home Premium 64bit
Installer Standalone
Release 2.2.0

I ran the installer with default settings, choosing TortoiseBzr feature, not removing any prechecked features, nor changing the install location.

During the install process my taskbar and desktop icons disappeared. The process explorer.exe was still running, but i found no way to make the taskbar or the icons reappear. Killing the exeplorer.exe process and the relaunching it from the task manager file -> New Task (Run..) restored system to working condition. I was not able to reproduce the crash by installing Bazaar again to another directory.

From windows event viewer i found the following info:

Application 'C:\Windows\explorer.exe' (pid 3068) cannot be restarted - Application SID does not match Conductor SID..

 System
  - Provider
   [ Name] Microsoft-Windows-RestartManager
   [ Guid] {0888E5EF-9B98-4695-979D-E92CE4247224}
   EventID 10010
   Version 0
   Level 3
   Task 0
   Opcode 0
   Keywords 0x8000000000000000

  - TimeCreated
   [ SystemTime] 2010-09-21T14:32:30.807210300Z
   EventRecordID 3821
   Correlation

  - Execution
   [ ProcessID] 9132
   [ ThreadID] 2152
   Channel Application
   Computer Main

 - Security
   [ UserID] S-1-5-21-2809198797-2326204720-1645288043-1000

- UserData
  - RmUnsupportedRestartEvent
   RmSessionId 0
   Pid 3068
   FullPath C:\Windows\explorer.exe
   DisplayName Windows Explorer
   AppVersion 0
   AppType 4
   TSSessionId 1
   Status 67108865
   Reason 1

second error:

Application or service 'Windows Explorer' could not be shut down.

- System
  - Provider
   [ Name] Microsoft-Windows-RestartManager
   [ Guid] {0888E5EF-9B98-4695-979D-E92CE4247224}
   EventID 10006
   Version 0
   Level 2
   Task 0
   Opcode 0
   Keywords 0x8000000000000000

  - TimeCreated
   [ SystemTime] 2010-09-21T14:33:01.879987600Z
   EventRecordID 3824
   Correlation

 - Execution
   [ ProcessID] 5776
   [ ThreadID] 3544
   Channel Application
   Computer Main

  - Security
   [ UserID] S-1-5-21-2809198797-2326204720-1645288043-1000

- UserData
  - RmApplicationEvent
   RmSessionId 1
   FullPath C:\Windows\explorer.exe
   DisplayName Windows Explorer
   AppVersion 0
   AppType 4
   TSSessionId 1
   Status 17
   Pid 3068
   nFiles 0

  - Files
   File