Ok, I was about to post a whole paragraph on how to do this in Win9x machines, but since you have a WinXP machine, this will be easier and different. BTW, this thread is in the wrong forum.
Instead of changing the name of the folder, because that's not as easy, just make yourself a new acct and delete your existing windows acct. To do this, boot into safe mode. To boot into safe mode, turn on your computer. As soon as you turn it on, hold down the "F8" key. This will show you a selection screen. Choose "Safe Mode". Then log into the "Administrator" acct. goto Start>Control Panel>User Accts. Delete your Alyssa acct in there. Make sure and choose yes when asked to delete your Documents folder. This will delete "WTFever" folder as well, so make sure you back up any files you have in there. Then create a new one. Make sure you set your new acct as "Computer Administrator" and not "Limited acct" so you can install programs. This will fix your problem.
BTW, here is what I *was* going to post for Win9x users:
If you don't care about the files inside the folder and just want the folder gone, you can boot into a MS-DOS prompt. Note, this will delete any profile that uses that folder and it will probably delete your Administrator acct, so make sure to make a new one first. To boot into safe mode, follow the instructions here
. then navigate to the folder and delete it. so that would be "C:\Docume~1\". To get to there, type in "cd Docume~1" (w/o quotes). Then type "del WTFever" (w/o quotes) to delete the folder. You may rename the folder from here, but you won't be able to use that acct anymore.