I have found that a lot of users have intermittent problems with PeopleSoft browser compatibility. Some of those can cause a lot of unnecessary time spent troubleshooting these issues, i.e. spreadsheets are not being downloaded, pop-up blocker etc. These steps preferably should be implemented on the Domain Security policy level and given to HelpDesk personnel. This should also ensure that windows and browser updates will not affect this changes. Please click on the link below to access a detailed document  from Arizona State University:

http://www.asu.edu/courses/oasis/_JobAids/SetYourBrowserforPeopleSoft.pdf