Problems Opening Office Files

Here is my dillema. When opening a word or excel file by going through windows explorer there is a significant delay in the file opening. But if we open the word or excel program, then go to file, open and browse for the file, it opens fine without a problem and there is no delay.

We are using symantec corporate edition which I thought might be causing the problem but I am not sure.

They are connected to the network also so its not because of a map drive that isnt connected or anything.

We are using Office 2003 SP1 on a Windows XP with SP2 on it. The workstations are running on all the latest patches for windows and office.

If anyone has any suggestions for me, I am all ears!

Thanks!