MS office and Outlook 2003 problems

Hi, I have just had to re-install my OS…which is Windows XP. Everything went fine and nothing was lost but I can’t start up any office applications and Outlook seems to have lost it’s access to certain DLL files.

When I look at my Program Configuration menu it doesn’t show MS office as installed, but all the files appear to be present.

Can someone explain what happened when I re-installed XP and what I can now do to get Office and more importantly Outlook working again.

I don’t have my original installation CD to hand.

thanks
John.