Hi,

My Windows account do not have administrator priviliges anymore even
though the user account window accessible from the control panel claims
I do.

I did my first time programming with setting ACL:s. I thought I had
completed my application since it seemed to work fine setting the ACL:s
the way I wanted to.

Then I had a huge problem one day all of a sudden. My laptop claimed I
did not have DotNet 2.0 installed (even though I have, I can even see
it in the add/remove programs list).

I  went into Windows explorer and clicked on the c:/Windows folder. The
Microsoft.NET folder existed but it had no + sign indicating
subfolders. When clicking on it it I get a not available, access denied
kind of message.

I am not able (or allowed maybe) to install, repair or remove DotNet
2.0.

I went to "Windows Update" on the Web to download updates for my OS
(Win XP pro SP2 by the way) but there I got the message that I have to
have administrator priviligies to update Windows.

The very same thing happened a couple of weeks later on my other
computer (this one I am using right now, I guess I will format this one
tonight...)

Can it be my application messing my system up?

All I do is set some files (application specific) (full rights except
delete) for all Windows accounts. My application is written in c# and
depends on DotNet 2.0. The methods I use for setting ACL's are:
AddAccessRule, RemoveAccessRule, SetAccessControl.

During the developement of this application (about a year) I have NOT
had this problems earlier. I got them after trying setting ACL's. One
other thing I have done recently is adding dotnet2.0 and windows
installer 3.1 as prerequisites in my VS2005 setup project (could this
be the source of my problem?).

I guess these methods have been used plenty and also VS2005 setup
project has been tested very much. When I got the problems on the first
computer I thought, well a case of bad luck... but when I got it again
on another computer I begin to wonder. I have tested for viruses - none
found.