MS Office 2003

While trying to select a Word or PPT or Excel file through MS Office application (Word or PowerPoint or Excel) through file->open then system hangs for quite some time and then the folder opens. Same thing happens even while navigating through subsequent sub-folders. Finally, after much delay I can able to open the file. Other applications like Adobe Photoshop, CorelDraw and Adobe reader do not show such problem.

The problem is also observed while navigating a picture file (.jpg/.tiff etc.)to be inserted into the MS Office application.

My system configureation WindowsXp Prof. with 1 GB RAM.

This problem was not there before, it has started very recently. I have uninstalled and re-installed MS Office, also I have reparired the WindowsXP installation and scanned for virus

Pl. provide a solution to overcome the problem.