Administrator can’t start or uninstall app

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I have a VoIP app called MagicJack, which I last used in April 2013. It has never caused a problem before.
On Dec. 3, I doubled-clicked to start the app, and got:
“This program is blocked by group policy. For more information, contact your system administrator.”
I cannot find any local group policy that seems to apply.
Thinking to uninstall and reinstall, I went to Programs and Features and clicked to uninstall, getting:
“You do not have sufficient access to uninstall magicJack. Please contact your system administrator.”
These results occur whether signed onto Windows as standard user or administrator.
I am guessing that something has happened to Windows (maybe a recent patch?), not the app.
The PC is Lenovo ThinkPad T430 with Win7 Pro x64, fully patched.

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What security apps are you using?

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What security apps are you using?

I have Norton Internet Security and Malwarebytes AntiMalware both active full-time. I run a Malwarebytes full scan monthly.

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Try a system restore to a date prior to the problem.
Also, boot into safe mode with networking. Then download and run Malwarebytes.
http://www.malwarebytes.org

Jerry

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Try a system restore to a date prior to the problem.
Also, boot into safe mode with networking. Then download and run Malwarebytes.
http://www.malwarebytes.org

Jerry

The only available restore point is noon today EST, probably because on the weekend I ran CCleaner. In any case, the latest date that I know preceded the problem would be last April; even without CCleaner, I doubt that I would have a restore point that far back.

I have been running Malwarebytes full scans monthly for years, and have had the Pro version installed since Oct. 24.

I do have a system image dated June 30. Since then, I have updated 15 apps, so would prefer another solution if possible.

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Are you sure it’s not NIS that’s causing it?

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Are you sure it’s not NIS that’s causing it?

No, I’m not sure. Should I disable some feature(s) and retry?

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I would try with NIS disabled. If that doesn’t work, see if this thread can be of help: http://windowssecrets.com/forums/showthread//158102-Problem-installing-a-updated-program?highlight=group+policy

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Disabling NIS did not work.
I looked into Rui’s suggested thread, about resetting all group policies to default. I downloaded and ran the BAT file. This fixed the problem – MagicJack is now working again, under both standard user and administrator.
Thanks to Rui and Jerry for their suggestions.

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I am glad you solved your problem :).

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