Administrator account and internet browser problems

When logging in as domain administrator on windows XP PC's on the domain I am no longer able to launch internet browsers (IE7 or 8 or Firefox). Sometimes i'm getting a Runtime error C++ problem othertimes IE simply wont launch, no errors in event log. To make it more interesting it I can get IE to launch intermittently just by logging on/off a few times but problem then comes back.

1. Problem with all PC's not just some.
2. Used to work OK, can't define when it stopped working.
3. We have recently moved to a mixed 2003/2008 domain (could be this?)
4. Works OK with Windows 7 PC's
5. Have tried installing latest C++ redistributables
6. Works OK with non-admin accounts
7. No AD group policies have been created to curtail the Admin account.

I've possibly tracked it down to the fact that a default user profile is being applied to the administrator login. Where do I amend the default profile applied by Active Directory?

Any other suggestions as to why this has started to happen?
ITSMEPJBAsked:
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HDH-InformationSystemsConnect With a Mentor Commented:
If you are pushing IE preferences I would imagine it is being done through a group policy not through a default profile. However, if you go in to the user properties in active directory users and computers on the profile tab you can see if there is a default profile set. If there is you can try removing that entry. After that I would go to one of the problem computers and remove the profile there. Once that is complete you can login as the account in question and let it build a fresh profile.
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IanThCommented:
sounds like it could be a virus in the admin profile
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stergiumCommented:
Hello.
Did you have a look at the event viewer when you try to open web browsers?
Maybe its not classified as an error but as an informational one.
Have you changed the domain policy on opening specific browsers? is this happening with a e.g. google chrome?
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HDH-InformationSystemsCommented:
Are you using roaming profiles? If so try to wipe the roaming profile from existence and create fresh.
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ITSMEPJBAuthor Commented:
I think it might be the default profile (not roaming) that AD is applying at logon, I've certainly seen something flash up about IE 6 data preferences being setup during a new admin logon.

Where/how do I edit the default ntuser.dat file?
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