Each of the four members of our household has a separate user login for our main computer. For the last few days, although mine has been fine (I'm the main user, and the administrator) the rest of my family has been having problems with their logins. Examples include looking at YouTube and finding that although titles and descriptions of video clips appear as normal, there are no screenshots, and it doesn't seem possible to get any of the clips to play (no such problem on my login, just the others). Problems with facebook too, apparently, with it not working properly for the others, but it's fine for my login. In fact, we've just tried logging the others in, and at the moment it doesn't seem to be allowing them to access their profiles at all. Despite this, my login still seems to be unaffected.
Possibly a coincidence, but I did remove a few programs from the machine a few days ago, as I felt there were too many programs we weren't using. However, I'm pretty sure I didn't delete anything important, and if I had deleted something important, surely it would affect all users rather than leaving me unaffected...?
Can anyone tell me what to do, please?