WTF

How come my computer skips in videos and cursor movement? Every time this occurs, the next thing that happens is any music i'm currently playing slows down and skips ALOT when I launch Firefox.

The only remedy I've been using for this problem is re-installing windows. The problem comes back whenever it wants to. This time my video and cursor are skipping 4 days after I re-installed windows.

I added EnableUDMA33 to 0000 and deleted the folders/keys 0001 and 0002, then I remade the 0001 and 0002 keys and added ResetErrorCountersOnSuccess to them.

This is where I'm confused because it doesn't let me check what mode my Primary IDE Channel is running in. I go to Device Manager/IDE ATA/ATAPI controllers/Primary IDE Channel/Properties and the tab in which I check the mode is gone. It was called 'Advanced Settings' it's still there when I check my Secondary IDE's properties.

And none of the registry entries have the collapse symbol [+]

What did I do wrong?