What is on my Mac Book's HD after Lion Installation

Hi, all,
a retrospective newbie query, after an apparently successful Lion 10.7 installation.
On snooping around my Mac Book's HD, I found -
Applications
Install.341HIM0FB (opens up  > private > tmp)
Install.342xzxGUj   (opens up > ditto)
Library
System
Users
Re. folders 341 and 342 - are these part of the installation or installation leftovers? Do they serve any purpose? Opened up, little information is within. 2KB.
Can/should they be deleted?
Any helpful comments appreciated. Tks
Ken

Ha  ha, I misread that as "My wife is very slow after installing mountain lion on my Mac book pro"
BTW on my MBPro (late 2009 with max RAM) Mountain Lion runs very well with no slowing down.

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