Reference Memory Error 0x7c91888f issue

Hi,
I recently installed Microsoft Office 2007 in my desktop, but I did not remove the MS Office 2003 (just for future references). The installation went well. Yesterday a pop up message keep appearing on my screen every time I tried to open any MS Office Application. I tried to re-boot the computer a couple of times, but the problem doesn’t seem to go away.
Because this problem is new to me, and I really don’t know what to do, I just ignored it and clicked the cancel button and continued with my work.

EpfwWindow: ekrn.exe – Application Error
The instruction at "0x7c91888f" referenced memory at '0x03f621b0". The memory could not be "read".
Click on OK to terminate the program
Click on CANCEL to debug the program
As of now, all other functions in my desktop are working properly. My question is, does this error have any present or future effects on my computer. I want to prevent any problem in the future as all my documents are saved in my desktop.
Many thanks.
