please help me out, heres an easy 10 points

ok so my uncle accidently did a cleanup on eour windows xp computer to clean up the comp and unused icons and when i checked it half of the icons
were gone! please is there some way to undo this and get it back?

What are Web Client/Publisher Temporary files?
While cleaning up the disk C for better space under the performance and maintenance programme of the control panel, the web Client/Publisher temporary files are not getting deleted/erased, inspite of the computer saying that they are not necessary and can be safely removed, and even after putting a check mark in the box. Why? And how to delete them?

I want to clean my Hard drive Because it is really full (Duh!). How can i do this but still keep some of the programs I’ved installed. Also How can Ifuse my hard drive since my brother seperated it by accident.

Is it safe to delete either of these files?

C:\b86b6f62541bd7a754\msxml.msi

C:\b86b6f62541bd7a754$shtdwn$.req

I am giving my pc to my grand kids and want to give them a pc with just the factory settings and no info that i put on it over the years.