microsoft sql servers

when my system crashed i had to do a restore .when i tried to put sp2 back
on the system it keeps stopping in the middle after a couple of restores and
retries i went to the newsgroup...it says to make sure full control is
given...well when i followed the path it gave ..c:\program files\microsoft
sql server....that swherei'm stomped.i go into program files and can't find a
folder with microsoft sql server listed ...is there another place i can
look,or am i even in the right place?