Well, some things you can try:
1. Look if other sites work normally, for example:
www.yahoo.com2. Try another browser, see if it works on that browser.
3.Download an anti-virus program and do a scan! AVG, Avast, Norton, Windows Live OneCare etc. (Well AVG is free, not sure about the others)
If this does not help, I don't think I can help you.

Edit:
After rereading your first post, I think your Antivir Webguard is blocking
www.hotmail.comI do not know how this program works,but most programs have some sort of list of blocked things. Look if you can find the site and take it out! (And if you dont know how, you can try turning it off)