Thanks for your hint: it worked for me
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this bloody “trz*.tmp” installed itself in one of “My Documents” files, on an external hard disk, and used to “eat” all of my ram
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. As it was Avast who alerted me, I tried a complete scan with it (with my own deep requirements); then, I used Spybot… did a full scan disk… CCleaner… Glary… with no results but stopping all the alerts > however, it was still where Avast told me (got to know about it by pointing the name in the alert with my mouse (it would be time Avast finds a solution since, on all fora I went, all victims of this malware used this antivirus).
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Following your advise, I downloaded “Take Ownership” and operated as you indicated: I at least could remove the last “trz*.tmp” without it replicating.
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Thanks a lot,
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Marco