outlook folders give error: "The operation failed. An object could not be found".

I've googled this quite a bit, but haven't had much luck. I need a heavy duty registry expert to give me some more ideas.

I have 7 folders open in outlook 2003.  3 are on c:\ActivePsts\  and 4 are on c:\ArchivePsts\

Today I tried to use file > properties > advanced but I got the error message. I get the same error if I try to close the PSTs.

  The operation failed. An object could not be found.

Only the 4 files in ArchivePsts have this problem, but they seem to be fine in all other respects.  I have no problems manipulating the emails in them.

Also, when I go to file  > Data File Management  I only see the 3 files in OutlookPsts.

I don't want to rebuild the profile (My 3rd party email indexer takes almost 48 hours to build the indexes!)

I tried following the instructions in http://www.computing.net/office/wwwboard/forum/5203.html

I found four subkeys of HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\rberke
 subkey         001e300a        001f3001           001f6700    <===data name  
   040de ...    mspst.dll         f.o.l.derName1   c:\a.r.c.hivePSTs\PstName1     the whole name is double character, but the mspst.dll is single character
   36726e ...        etc                      etc
Only the bad folders had the single character "mspst.dll" entries. Good folders had double character  m.s.p.s.t..d.l.l.      

I deleted the 4 subkeys and opened outlook.  I thought I was successful because the 4 bad folders were all gone!

Alas, I then discovered that the 3 ActivePsts now had the operation failed problem.

I restored the subkeys and the 3 ActivePsts are back to normal, but the 4 ArchivePSTs are again broken.

I need a heavy duty registry expert to give me some more ideas.

RBerke

P.S. Just in case you want a little more context of my registry, here it is:
HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\
          Profiles
               Outlook
                   0930f6ac16575f4e96c9b3819716ee10
                   0a0d020000000000c000000000000046
                   13dbb0c8aa05101a9bb000aa002fc45a
                   28b3d439c0843a469a27762965be9044
                   3517490d76624c419a828607e2a54604
                   ....Bunch more ending in  ...
                   f86ed2903a4a11cfb57e524153480001
               PstLoadTmp000
               PstLoadTmp001
               ....Bunch more ending in ...
               PstLoadTmp021
               rberke
                    040de91705c69a42b71adfdd3d8fc243
                    09d99e39abb0ec4cbee2311a31937bf5
                    0a0d020000000000c000000000000046
                    Bunch moreStart Free Trial