Browser is the application that you physically use to view webpages. 99% of all windows applications have a HELP menu and 99.9% of those that do have a help menu also have an 'ABOUT' selection within the help menu. This will tell you what program it is as well as what version.
If you go to HELP/ABOUT what does it say? For example I use Firefox 188.8.131.52 primarly but I also use InternetExplorer version 6.0.2900.2180 SP2 from time to time.
If your using IE make sure its up to date. You should be doing this regularly anyway by visiting http://www.microsoftupdate.com
and if you have any critical patches install them all regardless of how long it takes. Look at the recomended patches and install anything assocated with the browser. If its a browser other than IE use IE instead and see if the issues continue. All windows machines have IE installed. Do you recall the lawsuit by the government and Microsoft over this practice.