Help - Repair Services for Unix 3.5

I need to reapir or reinstall Services for UNIX 3.5 on an XP SP2 box.

This system has had SFU for several years. As of today, I keep getting
dialogs:

Windows Installer
Preparing to install
[Cancel]

followed imediately by

Windows Installer
The feature you are trying to use is on a CD-ROM or other removable disk
that is not available.
[OK]
[Cancel]
Insert the 'Microsoft Windows Services for UNIX' disk and click OK.
Use source:
<dropdown>[Please inert disk labeled 'Windows Services for UNIX Installation
Disk"] </dropdown>
[Browse...]

over the top of the first dialog.

Hitting the cancel button several times seems to finally clear the issue.

These dialogs seem to be initiated by the launch of applications. Many
applications seem to cause this.

I am pretty sure that back when I installed SFU 3.5 (several years ago), is
was from files unzipped from a downloaded file to the local filesystem - not
a CD.

I have tried re-downloading and unzipping SFU 3.5, then Browsing to point
the Windows Installer dialog at the relevant directory. This does not work.

I have tried Start>SetProgramAccessAndDefaults>ChangeOrRemovePr ograms
- SFU>Change
I get the same dialogs. (unable to run Change)

I have tried Start>SetProgramAccessAndDefaults>ChangeOrRemovePr ograms
- SFU>Remove (unable to run Remove)
I get the same dialogs.

I have tried just re-installing over it
I get the same dialogs. (unable to run Install)

Note that launching any of numerous applications will cause the abberational
behavior.

================

Now the backstory:
Today is when this started.
I have just moved my System/Boot drive from one physical HDD to another.
I moved by:
- cloning the old HDD to a temp HDD with dd in a Linux LiveCD
- boot XP off the temp cloned HDD (no problems at that point)
- use DiskMgr in temp to Initialize, partition, and format new HDD
- use Windows Explorer drag'n'drop to copy all files from old HDD to new HDD
(NTFS to NTFS), except:
System Volume Information\* (excluded from selection)
- SFU\usr\lib\cron\cron.log
- SFU\var\adm\.security
- SFU\core
the latter three filed refused to copy, no matter what I did. At the time, I
assumed it was a permissions problem, though I had Administrator rights.
I then powered down, removed all but the new HDD, and rebooted.

Then Start>SetProgramAccessAndDefaults>ChangeOrRemovePr ograms
- SFU>Change

In order to reinstall over SFU - to get the 3 missing files replaced.
This is when the problems started.

I am quite confused by this.
I could use some help.