Precisely every 10 minutes, to the second, my taskbar, which is on auto-hide, appears briefly and disappears again. A small window also appears but is so brief that I can't read the message.
I have looked in the list of Scheduled Tasks and there is nothing there set for a 10 minute interval.
This problem has appeared only since I eliminated the System Tool virus. Any ideas please?
I'm using Win 7, Google Chrome and IE 8.0. Acer 5738Z Pentium T4200 2.0GHz

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Please, observe following rules:

• Read all of my instructions very carefully. Your mistakes during cleaning process may have very serious consequences, like unbootable computer.
• If you're stuck, or you're not sure about certain step, always ask before doing anything else.
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• Never run more than one scan at a time.
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• The cleaning process, once started, has to be completed. Even if your computer appears to act better, it may still be infected. Once the computer is totally clean, I'll certainly let you know.
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In fact, I have discovered the following:

by slowing my computer down drastically using Cpukiller3, I was able to read the popup message.

It told me that Avira Antivir was not running. In fact, it was. So I uninstalled Avira and reinstalled it afresh.

The problem seems to have disappeared.

I can now scan with Avira and Malwarebytes and no problems are shown.

Should I be content with this?

If Avira and MBAM scans came up empty, you should be fine.