To elevate a program, rightclick its executable and select "run as administrator". [setups usually self-elevate, you see the "grey curtain" togther with the dialog "windows needs your permission to continue" - that's elevation].
NTFS-permissions can be altered by rightclicking the file/folder and selecting properties - security. The users group will need modify rights on that subfolder of c:\progfiles, I suppose.
There are commandline tools for both tasks. For elevation, see here:
http://technet.microsoft.com/en-us/magazine/cc162321.aspx, for NTFS permissions: use icacls.exe (belongs to any vista installation).