Bypass Installer for SQL 2005 Tools?

[Laurel]

I've been unable to install SQL Server 2005 Tools because it hangs at the
same point every time. In the course of trying to address this, I learned
about the advantages of doing things in SAFE mode. But apparently you can't
run Windows Installer in SAFE mode. Can I install it by hand? Following is
the log of the place where it stalls, and at the bottom is a list of the
things I've tried already (several suggestions made by people in this
newsgroup. Thanks!)

TIA
LAS

The last log file it created was SQLSetup0007_my_user_name_SCC.log.

This is the last thing that was written to it. (asterisks are mine)

******
Processing article DriveWriteAccess
Openning namespace \\root\cimv2
GetNamespace \\root\cimv2 returned 0 (0x0)
Scc Error: 0 (0x0)
Error code: 0 (0x0)
Calling callback function for reason: 0x4
Callback function returned TRUE

Processing article COMPlus
*******

Here are the things I've tried so far.

- Unplug computer from the internet
- Rebuild the COM+ catalogue
- Let it run for a really long time (hours) - I check the log file at the
beginning and end - no change
- Get a fresh copy of the install kit