Frequently Asked Questions

Chances are, others have the same questions that you do. Therefore, we have taken the common questions for Diskeeper, Sitekeeper and Undelete and provided the answers (and the questions) below in our Frequently Asked Questions section. Simply select the product below that you have questions about. If you can’t find the answer you’re looking for, you can submit a tech support question here.

Diskeeper | Sitekeeper | Undelete

Question
"Error 1631." when installing Diskeeper.
Answer
This behavior can occur when you try to install a program that is installed using Windows Installer. The following registry key contains a value of data type REG_EXPAND_SZ, and the string is null: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment Userenv.dll returns an error message when it tries to process the value, and Windows Installer quits. The following example shows a null value: Value Name: CLASSPATH Data Type: REG_EXPAND_SZ String: This is a documented problem with Windows Installer on Windows NT 4.0 systems. The actual fix is not generally available yet, and may be released in a Service Pack. The quick solution is to go to Control Panel, System, Environment tab and scroll down the list in the windows looking for a variable that has no value. It is likely to be a User variable, but could be a System variable, too. When you find the variable that has no value, highlight it and hit delete. This should fix the problem. Here is the link to the knowledge base article on the issue: http://support.microsoft.com/support/kb/articles/q251/2/74.asp?LN=EN-US&SD=g

Question

"Error 1631." when installing Diskeeper.

Answer

This behavior can occur when you try to install a program that is installed using Windows Installer. The following registry key contains a value of data type REG_EXPAND_SZ, and the string is null:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment

Userenv.dll returns an error message when it tries to process the value, and Windows Installer quits. The following example shows a null value:
Value Name: CLASSPATH
Data Type: REG_EXPAND_SZ
String:

This is a documented problem with Windows Installer on Windows NT 4.0 systems. The actual fix is not generally available yet, and may be released in a Service Pack.

The quick solution is to go to Control Panel, System, Environment tab and scroll down the list in the windows looking for a variable that has no value. It is likely to be a User variable, but could be a System variable, too. When you find the variable that has no value, highlight it and hit delete.

This should fix the problem.

Here is the link to the knowledge base article on the issue:

http://support.microsoft.com/support/kb/articles/q251/2/74.asp?LN=EN-US&SD=g

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