Password problems

[foxmoth]

I seem to be unable to store passwords (eg for company web site) at the moment, just put Broadband on (NTL), and it seemed fine, but 24 hours later, every time I open up Internet Explorer now I have to completely reenter my user name & password to get onto the company website, this in spite of ticking the "remember password" box ( the first time this happened it also seemed to log me out from Pprune, though this has not happened again since).
Any suggestion from any computer wizz?