I assume you have asked this question of the developers of this optimisation utility?
The problem here as I see it is two-fold.
1] You are using a software utility that is performing some action you don't want it to. Unless you have missed something in the software's Tools > Options, (or similar), then it seems there is no setting to change.
In that case, your first step would be to discuss your difficulty with the software developer. They are sure to have a Help & Support section in their web site.
2] A solution was offered here which prevents the deletion of the contents of the Prefetch folder. That is to stop using the software that appears to be deleting those contents automatically. CNET relies on members helping each other out in these forums, but since no other member posted in reply to the original post, may be that implies that no-one else here has the knowledge and/or experience of this software to offer any other advice. In that case, no longer using the software appears to be a relevant alternative.
Just a note though. Your first post in this discussion said that the original question had not been answered. The original; question was;
"I have windows Xp(sp3) and tuneup utilities 2009 installed. When I use TuneUp there is a recommendation "Prefetech Data Deleted". But there is no option to correct. What is Prefetech data and I have never knowingly deleted it."
What is Prefetch? That was the question, and a method of finding out that answer was given.
I hope that helps.