This may be because you have deleted your .minecraft folder which deletes your saves. when you re-open minecraft it will re download the .minecraft folder so your saves are not there. This is why you should back up your saves.
So basically I have been playing minecraft for a while now. However, about 4 days ago I noted all of the following overnight:
-My web browser will sometimes not even attempt to open when I try to
-Overall computer slowness at times
-.png and .jpg images will have a "Class not registered" error message and will not open
-Minecraft's launcher, title screen, and world viewer will function perfectly. However, whenever I go into a world or a server it will take an extra few seconds to load. Then, when I do get in, the whole world is black, my hand will not move or won't even be there, and the items in my inventory will still be stretched out as if I had just picked them up. Strangely enough, I get a pretty up-to-date reading of chat and sounds while frozen as such.
IMPORTANT: Whenever I go into my task manager > details, I see a bunch of 'svchost.exe' programs. The location is in my Windows32 folder. Are these OK?
I am using windows 10 on a somewhat-old computer (30-75 fps avg). Please let me know if you have this same problem or know how to fix it!
No, only if you delete your .minecraft folder, minecraft isn't 'installed' so you can't uninstall it either, just deleting it from your desktop does the trick, all your worlds will be left alone.
Copy the minecraft worlds from the file explorer
I think all the free minecraft is gone, and you cannot download it at all anymore.
No it doesn't because it is just like force upating but you do need to update your worlds.
First you must access .minecraft, a hidden folder in My Documents/Application Data. Go into the saves folder to see all the worlds that are on your computer. Now you copy the worlds you want from your computer, put them on the other computer, and paste them into .minecraft's saves folder.
There's only one world that keeps on going and going.
you link it to your minecraft account
Minecraft
yes.
No.
Yes you can, their worlds wont appear on your computer, all you have to do is download the minecraft application. there is no limit on how many users are on one account.
Well there is one way to get into good worlds in Minecraft. Type in a seed.