Thank you guys for the information. I do understand about windows updates and what a pain the neck is, I hardly trust MS any more, but for security reasons I do keep my windows xp up to date all the time. My computer were I use AH is what I called my game computer, I have the main one which hold the office, video, photographs, accounts and so on software and the games well it is only a game computer.
I defrag my computer religiously once and sometimes twice a week, also use CCleaner and regcleaner to perform biweekly maintanance, but after reading the replies, I can honestly think that the old copy of FS2004 was problably the one causing the slow down. Will install AH today and will see if theres any difference in performance which I am prediciting it will not.
Thank you again.