Are you sure Print Spooler isn't running in Control Panel>Administratve Tools>Services? It's an alphabetical list.
Spoolsv.exe should be in the c:\windows\system32 folder but if it isn't, look in the c:\windows\service pack files\i386 folder and copy it from there to system32.
If that fails, pop in your XP CD in case it's needed then go from Start to Run and into the open box, type cmd and press Enter. At the black form Command Prompt that comes up next, type sfc /scannow then hit Enter key.
The System File Checker will run anthen find and replace any missing files, including those which run Print Spooler