It could be something with the IE a weird glitch- trying a different browser would give you an idea if it is your system {windows/IE/ settings/anti virus conflicts etc}
if you try the firefox and it still has the same problem then we know it isn't only an IE problem.
but if firefox works for you then we know it most likely is a IE setting or glitch

Just a simple way to narrow it down a bit.

Or- if you did any kind of system updates or changes lately you can try to do a System Restore??
You won't lose any info - it just sets the windows system back to the time/date that you set.
the restore points available should be highlighted - it's pretty easy to do and each step explained
to get to it- go to
Start/Programs/Accessories/System Tools/and down the list to System Restore
If you try this close all other open programs first.