the easiest way is right click on my computer- then go to -properties
the general tab should tell that info.
or go to control panel - systems - and the same thing will pop up

for printer/scanner settings go to that section in the control panel and right click on the printer or scanner that is displayed for the preferences & properties and check to see which is set as default
make sure the one you want to use is set as default

for your IE7- I think just go to view/toolbars/customize?
maybe someone else knows it better - i don't use it-
I use the Netscape or Mozilla Firefox browsers.