keyboard cursor jumps weirdly when typing

I am working on a Dell Inspiron 1100 with an A32 BIOS.

I have a problem that, when I type for a certain amount, the cursor will sometimes appear to randomly jump places. Usually it jumps to another point in the same paragraph, but sometimes (like when I typed this message), it jumped instead to another text field. I have had the cursor jump while typing a URL in a browser window as well.

Pressing the "home" key in particular causes the keyboard to type normally for a few characters, but then the cursor will jump weirdly to another location in the paragraph. However, even when It don't touch the "home" key at all, the cursor is still known to jump.

Usually, the jumps are to a random place, and there is no advance warning. Hence, my words can get split up in odd places while typing, and I have to retype things a lot.

I am running both Windows XP (a reinstallation) and Red Hat Linux 8.0, and have had the same problem in both operating systems.