[David Blythe Guerrero]

Entry "HKCR\ComPlusMetaData.MsCorHost" refers to invalid object "{727CDF4F-3BA0-11D3-8738-00C04F79ED0D}".
Entry "HKCR\ComPlusMetaData.MsCorHost.2" refers to invalid object "{727CDF4F-3BA0-11D3-8738-00C04F79ED0D}".

Since installing (from Windows Update) the
.Net Framework update to SP2 I have been having a problem with MSCorHost invalid
entries in my windows XP SP2 registry, that WinDoctor
nor any other regedit utility or registry cleanup
program I have tried can fix (all fail). I used to work for Dell,
know quite a bit about manual reghacks too, but it
can't be manually deleted either even from SAFE mode,
windows for some reason is protecting these invalid
entries hardcore. MSCorHost appears (from various
google and microsoft searches) to have to do with
Windows COM+ - but this is all I can find out, and
even installing a new COM+ hotfix from Microsoft from
windows update does nothing to fix the bad entries
(which are found not just by Windoctor but every reg
utility I have tried) (which lists them as INVALID
entries). Has ANYONE figured out how to get these
removed? Also tried both full reinstall AND removal of .NET Framework from microsoft, but the bad entries remain.

More info: on mine it also refers to invalid entry
that appears to be related for SymWriter.pdb which
also cannot be removed. from Windows Update) the
.Net Framework update to SP2.
There is NO Virus nor spyware on my machine at moment,
confirmed with AdAware (with settings expertly tweaked
per suggestions of this forum), Spybot SnD, McAfee
antivirus regsitered and Micro-Trend online AntiVirus
AND Spyware Scan. Also have had no VIRUS in a year and only once on this PC and it was quickly removed. I do occasionally get spyware but do
regular scans to remove. This problem appeared
immediately after installing ( Have now uninstalled it,
but STILL these invaid entries remain.

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System restore would roll the registry back to the point prior to update, solving that issue.

Did you search on 727CDF4F-3BA0-11D3-8738-00C04F79ED0D
in the registry

Does that key exist in the registry?

I have a fully updated system on this machine and that key does not exist. Perhaps a temporary key used during setup?

[gerryf]

System restore would roll the registry back to the point prior to update, solving that issue.

Did you search on 727CDF4F-3BA0-11D3-8738-00C04F79ED0D
in the registry

Does that key exist in the registry?

I have a fully updated system on this machine and that key does not exist. Perhaps a temporary key used during setup?

[David Blythe Guerrero]

Ok Guys, think you can show this as resolved/Closed.
In received several suggestions (many thanks) and checked them all.
Still only 1 user on this Windows, and is me, and setup as an Administrator. (Loved the idea maybe .Net had setup new user account(s) but that one didn't pan out.
Gerryf - no that key no longer exists, which is prob why the entries referencing all show as invalid.

The suggestion that worked was modifying the permissions of the stubborn keys. I'd never run across that before in XP, and since I am labelled as Administrator on my own PC I had not thought yet to check permissions. But sure enough, putting checks on FULL CONTROL for each of the stubborn invalid keys then allowed me to delete them. Problem solved, again many thanks!

[equitysaver]

How did you change permissions on these individual files? I'm running Win 2000; I'm in the registry editor, but am not given the option of viewing/changing permissions/properties.

[TedTexas]

Regedt32 will enable you to change permissions. For an overview of regedt32 versus regedit, see http://support.microsoft.com/kb/141377.