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"Another version of the product is already installed" or "Your computer has a newer version of MSN Messenger than the one you are trying to install"

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I was installing third party software at that time without my consent some of the programmes installed in my system named Mirar . As usual I tried it to remove with Control Panel -- > Add/Remove Programs but it was not uninstalling. But when I launch the Internet Explorer there I can see a Mirar Tool bar installed and whenever I go to any web pages it will automatically pop up ads; it was really annoying to me. For uninstalling Mirar Toolbar you have to go Start -- >Run -- > Regedit and follow the path below

Delete the Following if it Exists : -

HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Internet Explorer \ Toolbar,
in the right pane, delete the value {179E4B4A-76C3-4F65-BCED-C9FA1A28D2EF}

HKEY_CURRENT_USER \ SOFTWARE \ Microsoft \ Internet Explorer \ Toolbar \ WebBrowser, in the right pane, delete the value {179E4B4A-76C3-4F65-BCED-C9FA1A28D2EF}

HKEY_LOCAL_MACHINE \ SOFTWARE \ Classes \ CLSID \ {179E4B4A-76C3-4F65-BCED-C9FA1A28D2EF}

HKEY_LOCAL_MACHINE \ SOFTWARE \ Classes \ CLSID \ {8A0DCBDA-6E20-489C-9041-C1E8A0352E75}

HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Explorer \ Browser Helper Objects \ {8A0DCBDA-6E20-489C-9041-C1E8A0352E75}

Reboot the computer.

Again Delete the following files if Exists: -

%SystemDir%\NN_BAR.DLL
%SystemDir%\NN_Bar21.dll
%SystemDir%\NN_Bar22.dll
%SystemDir%\NN_Bar31.dll

%SystemDir% is a variable (?). By default, this is C:\Windows\System (Windows 95/98/Me), C:\WINNT\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).

At Last Click Start -- > Settings-- > Control Panel, double click Internet Options --> click the Programs tab, and click on the Reset Web Settings .

Be careful while working in registry file may be sometimes you delete any Windows supporting files leads to system crash. There are plenty of sites supporting the Mirar toolbar and if you want to uninstall this toolbar you have to buy removal tool etc… costs ranging $10 -$100 approx. Another simple way is run a Spybot Spy ware (Freeware) search it will find these Mirar and DealAssistant and throw it out from your system. Sometimes if any mishaps you can see Mirar toolbar on add/Remove Items uninstalled then start formatting your PC.

Is any other way to uninstall these ad wares???