If your SMS 2.0 client install failed, and ZAK was installed, use regedt32 to navigate to:
Record the string values of the following Value Names:
TMP and TEMP
Delete the above Value Names.
On the Edit menu, Add Value names TMP and TEMP as type REG_EXPAND_SZ entries and enter the string values that you had recorded.
Shutdown and restart Windows NT prior to installing the SMS 2.0 client.