Microsoft Word 2003: very slow and continuously loading something

Question

When I start Word without opening any documents it works fast as usual... When I open documents it starts loading something (I can tell it by the busy shape of the mouse cursor) and never stops... Also moving word's window becomes very laggy.

I have Office 2003 Service Pack 3 on Windows 7 Ultimate 32 bit, it used to work without problems before... Any hints?

Answer 1

The user profile was corrupted.

I've created a new user profile and migrated the old user in it.