Enable / Disable Task Manager

There is a registry hack to enable or disable Task Manager.
Hive: HKEY_CURRENT_USER Key: Software\Microsoft\Windows\CurrentVersion\Policies\System Name: DisableTaskMgr Type: REG_DWORDValue: 1=Enable this key, that is DISABLE TaskManagerValue: 0=Disable this key, that is Don’t Disable, Enable TaskManager.
If you are an Administrator you can consider  using Group Policy Editor. For that,

Click Start
Click Run
Enter gpedit.msc in the Open box and [...]

An extension failed to initialize. Can’t open file extend.dat

Today out of the blue, when loading office 2003 on an xp machine, an error message appeared with the text:
“An extension failed to initialize. Can’t open file: extend.dat. The file may not exist, you may not have permission to open it, or it may be open in another program. Right-click the folder that contains the [...]