Excel Files Hang up on open

In a similar case, but faced with Power point files, it caused me to reinstall the OS completely, I tried to reinstall office, uninstall, update to SR1, but nothing helped...I am afraid that you need a clean installation for your OS.

good luck

Here are my guesses:

1) Files are corrupt in some way. I have had files that produced the same effect you describe, being slow to open and sometimes locking or causing a gpf. If you work with large Excel files or a lot of forms and controls, you sometimes run into this especially if you save the file frequently. You can decrease the size of the file and 'clean' some corruption by exporting all forms/modules/sheets, deleting them and then reimporting them.
2) Also experienced something similar with a virus shield program running. In this instance, the anti-virus program was scanning ALL add-ins (installed or not) when the file opened. This caused huges delays while opening and appeared to be locked (but if you waited long enough it finished).

It is best to copy any files locally onto your harddrive from the Network instead of actually opening them across the Network. There is a number of things that can cause the problems you are having, heavy traffic on the Network or configuration changes on the Network.

Hope this helps.