Firstly, it recommended to install Windows XP Service Pack 3: http://www.microsoft.com/downloads/it-it/details.aspx?familyid=5b33b5a8-5e76-401f-be08-1e1555d4f3d4
Try to reset user options and registry settings in Word test this issue, see: http://support.microsoft.com/kb/822005/en-us
Kindly reminder, Office 2002 support service has been expired.
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The customer installed Office 2010 and Windows XP SP3 and is still experiencing the problem. They also reset the registry settings as suggested in a previous post. The report is generated fast for one account on a PC and slowly for all other users on the same PC. Any other ideas on what we can check?