Windows xp reinstall

Yesterday I had to reinstall winxp with sp2. I had the trojan Metajuan which was removed after the reinstall.
Can I get the reinstall to recognize the many programs on my PC?
So far- I have tried to open Word & Excel via cliking on the exe files- but its not working.
Is there a way to do this? Or do I have to also reinstall (via the CD or download) every program I had on my PC?

Any help I can get is trult appreciated,
Linda G