Installed new Antivirus Software now Computer is extremely slow! Can I fix that?

Yesterday I installed a new Antivirus as my old licence was not valid anymore. I chose the free Avast. Now the pc is extrem slow. It takes about 8 min to start (before with Kaspersky it took 2 min). Is there something I can do?

Solution 1:

To remove Kaspersky products from your computer follow the following steps (by Kaspersky):

1. download the executable file kavremover.exe.
2. Reboot the computer in the Safe mode:
   • for users of Windows 8
   • for users of Windows 7
   • for users of Windows Vista
   • for users of Windows XP
3. Run the file kavremover.exe.
4. Enter the code from the picture. If you cannot read the code from the picture, click on the button next to the picture to generate a new code.
5. In the Following products were detected section select the required product to be uninstalled. Click on the Remove button. If you wish to delete some products, it is required to delete them separately.
6. The removal process may take some minutes.
7. Wait until a dialog window appears to inform you that the product was successfully removed.
8. On the open dialog window, click on the OK button.
9. Reboot your computer.
10. If you had more than one Kaspersky Lab product on the computer, you should rerun the removal tool and chose that product from the list and remove this too.

Solution 2:

As it is clearly stated in every anti-virus installer, you must not have more then one anti-virus installed in your computer at the same time or this will happen.

Uninstall your old anti-virus and it should fix the problem.