When I install I get to the Partition Manager with several options.

. Guided - Use entire Disk
. Guided - Use largest continuous space
. Manual

I don't think I want to use the first one and I get an error when trying to
run the 2nd saying the space is not large enough. I don't see any way to
resize partitions using the Manual option.

I booted to the Live CD and opened the Partition Editor, System > Admin >
Partition Mgr. I tried to Resize the main partition, but everything is
grayed out. Even if I change the size, the OK button is grayed out. The
Up-Down Arrows next to the size box don't work either.

The main partition is labeled like this:

/dev/sda1 NTFS 457.17 GiB boot (there's also a yellow triangle with an ! on
it.

/dev/sda2 Extended 8.59 GB

Sda5 Linux Swap 8.59 GB

I guess I tried installing Ubuntu before.

So where do I go from here?