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Try bootin to safe mode by pressing F8 on turning on the system then try to uninstall by going into the control panel [Programs(vista)/Add or Remove Programs(XP)]
By doing this you will be able to uninstall the AVG anti virus.
Then restart and the system will boot in normal mode then install Kaspersky. Never have 2 anti virus in a system. Just a word of caution.
you might not have uninstalled AVG .instead you could have deleted the AVG folder. AVg components are still there in the registry.if you didnt uninstall it ,install AVG once more and uninstall it manually. if its not working remove AVG components from registry here are the instrucions: To remove the AVG registry entries, open Registry Editor (Start->
Run-> Regedit). In the registry editor, navigate to the entries
Right click on these entries and then delete them. If you are not
comfortable about deleting registry entries, you can use a free
registry cleaner. If you are using a 64 bit machine, then these are the
entries to be removed.
Strippy had asked you a right question. You may be trying to install AVG when you have already one antivirus program running. OR you had once installed AVG sometimes in the past, but uninstallation was not properly done. Hence it is showing registry key error.
1. If you are running any anitvirus prog now, first uninstall it. Then restart the machine.
2. Now you try install AVG. it should install. if not, try the following
Go to system restore and create restore point for safety.
go to run and type regedit and then enter
Press cntrl + F for finding earlier registry keys of AVG. Try to find out all old registry keys amd delete them all.
GO TO CONTROL PANEL ON YOUR PC AND LOCATE ADD AND REMOVE PROGRAMM THEN CLICK ON THE APPLICATION YOU WANT TO UNINSTALL THEN UNINSTALL IT AFTER THAT GO TO YOUR HARD DISK DRIVE C LOCATE PROGRAMM FILES THEN OPEN IT AND LOCATE FILE OF AVG8 AND DELETE IT BUT YOU MOST FIRST UNINSTALL FROM CONTROL PANEL BEFOR DELETING THE FILE. HOW TO GO TO CONTROL PANEL, CLICK ON START MENU LOCATE CONTROL PANEL CLICK ON IT THEN LOCATE ADD OR REMOVE PROGRAMM AND CLICK ON IT WHEN OPEN CLICK ON THE PROGRAMM NAME YOU WANT TO REMOVE AND AT THE RIGHT HAND SIDE YOU WILL FIND (CHANGE/REMOVE) CLICK THEN YOU FOLOW THE INSTRUCTIONS. AFTER FINISH THE UN-INSTALL YOU CAN INSTALL THE NEW ANTI-VIRUS