This site will look much better in a browser that supports web standards, but it is accessible to any browser or Internet device.
Go to tools, internet options, content, autocomplete and clear your forms
Microsoft has released a knowledgebase article about this problem:
Delayed Response When Editing Internet Explorer Forms and Outlook Express May Take a Long Time to Start
Malware may be the cause of your problem. Check out my troubleshooting link for more advice.