SNAFU & VDQ : VirtualBox repair or replacement??

[Beartooth]

	I seem to've scrod up really royally this time. So royally I'll 
have to build up to my Very Dumb Question (VDQ).

	Thanks to a clueful friend, I had an installation up and running 
under Fedora 14. Then something (unrelated afaik : I had an app open on 
my virtual XP, but was doing something else entirely -- I disremember 
just what) went bonkers, and crashed X. I had to log back in. 

	Now when I click on the desktop launcher, I see the VB popup I 
used to -- but only for a second or two.

	Poking around, I found that /usr/lib/virtualbox/VirtualBox 
belonged to root, not my userid. 

	It must have been a major borass to try (as root) doing 
"[root@HBsk3 virtualbox]# chown -R btth:btth VirtualBox" because it not 
only didn't help, but "chown -R root:root VirtualBox" didn't fix it.

	Now, when I click the launcher, I get an error box saying : 

Effective UID is not root (euid=500 egid=500 uid=500 gid=500) (rc=-10)

Please try reinstalling VirtualBox.

	I tried. rpm can't seem to do that. rpm -e VirtualBox tells me 
it's not installed; but rpm -Uvh on what I had told me it was already 
installed. 

	I went to the website and downloaded

VirtualBox-4.1-4.1.2_73507_fedora14-1.x86_64.rpm --which, fortunately, 
was more recent than what I had.

	But now both rpm -Uvh and rpm -ivh give me multiple screenfuls of 
errors like this : 

	file /usr/share/virtualbox/src/vboxhost/vboxnetflt/
VBoxNetFltInternal.h from install of 
VirtualBox-4.1-4.1.2_73507_fedora14-1.x86_64 conflicts with file from 
package VirtualBox-4.0-4.0.12_72916_fedora14-1.x86_64

	Should I just delete those earlier rpms from /home/btth? Go to /
usr/share (or maybe /usr/lib, or both) and delete virtualbox? Or what? 
Put an f in the rpm command??
-- 
Beartooth Staffwright, Not Quite Clueless Power User
I have precious (very precious!) little idea where up is.