Please answer the ten numbered questions. Copy and Paste if you don't want to do a lot of typing.
"So, I opened up PArtion Magic 8.0 for the first time in ages..."
1. Why did you use Partition Magic in the first place?
2. Was there anything wrong with the partitions in Windows before you used it, or were you having other Windows problems?
"...it gave me two errors:
1) That one of my drives "appears to have partitions created using a different drive geometry" and it cannot be fixed so I should format.
and
2) That there was some partition table error that could be fixed.
So, I fixed the partion table error and me E: drive went from showing up as BAD to showing up fine. However, my F: drive shows up as BAD."
3. - For 1) - Are you using drive overlay software on that hard drive?
4. - What did you partition that drive with - XP, or something else, such as a drive preparation utility availble free from the maker of the hard drive?
5. - For 2) and after - was F: fine before in Partition Magic?
Take a look at the physical drive that has the partition Partition Magic shows as F: in XP (it may NOT be the same drive letter in XP - note the sizes of the partitions and the sizes of the data on them to make sure you are looking at the same one) in Disk Management.
6. Is there about 8mb of un-partitioned free space at the end of that physical hard drive?
7. Is there about 8mb of un-partitioned free space at the end of the other physical hard drive?
8. Exactly what does Disk Management say about E:?
9. Can you access E: fine in My Computer and Windows Explorer?
If you can, leave things as they are for the time being!
"Yes, there is technically an undo function, but it's not available since I didn't actually do anything."
Yes you did - you corrected the supposed partition table error. If there was an Undo available after you did that, it might not be available unless you use it in the same session - if you exited the program then went back in later, the ability to Undo what you did may be lost.
I don't think running chkdsk will do any harm, but you can't run it on any partition that cannot be seen in My Computer or Windows Explorer in any case. I doubt it will help. For the time being don't run it on any partition XP sees but has problems with, if applicable.
For that matter, running chkdsk without any switch after it only finds errors - it doesn't fix them - it can't do any harm. It's chkdsk /f that fixes errors.
"I don't have anywhere to back it up without buying a new drive, which I can't really afford at the moment...."
10. Do you have a CD or DVD burner and blank disks? There are freeware backup utilities on the web, or you could use the one built into Windows, and you don't need to back up anything you can easily re-install or download again.
Or for that matter, hard drives are cheaper than ever. If you don't already have enough blank disks, it may be cheaper and quicker to just buy a hard drive.
It would be a good idea to check the physical hard drive that has the supposed bad partition on it with it's manfacturers diagnostic utility, avalable free on the manufacturer's web site, to rule out the drive being defective.