On about the 12th or 13th of last month I suddenly couldn't open the IE web page. ... After I downloaded IE7 it still wouldn't download the web page.
Do you have problems accessing just one webpage/website with IE or all webpages/websites?
Delete your browser cache settings: from within IE: Tools>Internet Options>General Tab>Browsing History>Delete.
If the above doesn't work, try to reset IE - from within IE: Tools>Internet Options>Advanced Tab>Reset; this will de-activate all browser add-ons and clear your browser cache files. If IE works this way, add back your browser add-ons one-by-one until you get to the problematic one. Then, either don't use it or get a fresh version.
Once you are able to use IE, consider using FF anyway - it is faster than IE and many people think that it is more secure; just something to think about.
Good luck.