Drs.
If you've already removed avast, I'm not trying to get you to reinstate it.
However, if avast is still on your system, what you [or anyone else bothered by this situation] can try is to FIRST completely turn off avast's persistent cache feature, THEN remove the User Journal file. It should not come back again [unless some other program, beside avast, also uses it].
As long as avast's persistent cache is enabled, the User Journal file will be rebuilt.
Keep in mind that if you disable avast's persistent cache, it will increase the time it takes for avast to scan your system. For example, the first time I ran an avast5 scan, it took over an hour. But subsequent scans (by virtue of the persistent cache) took only around 20 minutes.