Sorry about the late reply.
It might be because your internet settings, and so your passwords and things are being deleted by your browser automatically every couple of days.
Some external programs can be set to do this too if you have any cleaning hard drive wizards set to run, which would clear the Tempory Internet Folder, and probably Cookies too, which would hold your password info I think to the site.
Go into your Browser and check in Tools, Options, or Prefrences.
Find anywhere where it says to automatically delete history or other files and disable it, or untick it.
If you do have Windows Disk Cleanup to run for example every few days, maybe by setting up a sceduled task in Start, Programs, Accessories, System Tools, Scheduled Tasks, as this could probably be set to load programs and auto remove settings like that at a given time every few days.
If this doesn't work, Try Firefox: (Pasted from a post by me on a thread and slightly modified to suit):
It is better than Internet Explorer in many ways.
Many people are switching, and is becoming popular now.
It is safer, more secure from spyware, and can be faster too. It offers advanced features, and...wait for it...wait for it...it allows you to import all your saved pages and history from Internet Explorer, and offers something called Tabbed Browsing, which makes it so you can open loads of links in the same window
Find it here:
You will never turn back, honestly, and this might fix the deleting problem which is what I hope for
Hope this helps...or enlightens you...one of the two