Just put XP in the machine and can't find the cookies or Temporary Internet Files folders in the Windows folder. Where do they put that stuff now? Where is a good place to get really familar with XP?

Look under:

User/Documents & Settings/Cookies
User/Documents & Settings/Local Settings/Temp
etc.

There are many many sites dedicated to XP. Kelly's Korner is very comprehensive as to troubleshooting:

http://www.kellys-korner-xp.com/xp_abc.htm

http://www.kellys-korner-xp.com/xp.htm

For a general tour go to: start/ all programs/ accessories/ tour windows xp