If you found those 2 files by using the search feature you should be able to right click on each then click to delete.

it appears to be installed with any product which is associated with leader technologies(they do the registration application), she likely at some time had or has one of their programs,(many companies use them including printer companies) it says it is used for one time registration purposes so it should be fine to remove it.
Is your program "spyware" or "adware"?
that is their reply in their faq page

this is the info from processlibrary
What is powerreg scheduler v3.exe doing on my computer?

you probably saw some of that already, you can remove it with out worry.

I never bother with the prefetch folder.

but you could install ATF for her and she can safely use it to help her with clean up
ATF-Cleaner

I would also tell her about using the secunia scan to make sure all the important stuff that needs updating is updated on her pc, those are very important and many leave huge vulnerabilities if not updated
Welcome to Secunia Online Software Inspector (OSI)
that is the online scan but you can get the one you install
Secunia Personal Software Inspector (PSI)

Thanks, Owbist and RC. I'll delete those files without any fears. My sister doesn't use her computer and relies on me to keep it clean and up to date. It's here for when her daughters visit. Thanks for suggesting the scan, Raven. I'll do that next.

Your help is greatly appreciated! :)

abreeze you can clean your sister's computer from yours if you wish without leaving home. I use Teamviewer which allows you to use your monitor, keyboard and mouse to control computers in other locations and have full control.

Unless of course you are close enough to pop over there when needed, in which case you get the added advantage of the personal visit.

Thanks, owbist... I'm bookmarking that site! That's a great suggestion as I'm out of state. :-)

I too use it to help my sister who is in a different state.