Can not open PDF's in Safari

Hi All:
I know this has been asked and answered so many time that I am sorry to post again. However, I have read many of the prior posts, tired the fixes, and still the problem persists. All of a sudden, without any erxplanation I know of, PDF links do not open within Safari, as in the past, but instead revert to the Downloads and open in Preview.
MacBook Pro OS: 10.6.8
Safari: 5.1.7
I have two other accounts set up and they both open PDF links within Safari.
I have downloaded Adobe Reader again, checked my plugins. I can’t locate any Adobe plugins on either my home account or hard drive, restarted, etc.
If possible, can someone try and offer assistance. It's one of those things which is bugging me and have been struggling with for the past three hours.
thank you.
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Hi Linc:
You and Carolyn seem to tbe the go to  people for this issue.
When I pull up the plug0ins from the Help Menu, I get an entire page. I've tried copying it below.
What really confuses me is that it works fine in my other accounts and I can't determine what is different in this account.
thanks,
val
DivX Web Player
DivX Web Player version 1.4.0.233 — from file “DivXBrowserPlugin.plugin”.
video/divx
DivX Video File
divx,div
Flip4Mac Windows Media Plugin 2.3.4
The Flip4Mac WMV Plugin allows you to view Windows Media content using QuickTime. — from file “Flip4Mac WMV Plugin.plugin”.
application/asx
Windows Media Plugin
application/x-mplayer2
Windows Media Plugin
audio/x-ms-wax
Windows Media Playlist
wax
audio/x-ms-wma
Windows Media Audio
wma
video/x-ms-asf
Windows Media Video
asf
video/x-ms-asf-plugin
Windows Media Plugin
video/x-ms-asx
Windows Media Playlist
asx
video/x-ms-wm
Windows Media Video
wm
video/x-ms-wmp
Windows Media Video
wmp
video/x-ms-wmv
Windows Media Video
wmv
video/x-ms-wmx
Windows Media Playlist
wmx
video/x-ms-wvx
Windows Media Playlist
wvx
iPhotoPhotocast
iPhoto6 — from file “iPhotoPhotocast.plugin”.
application/photo
iPhoto 600
Java Plug-In 2 for NPAPI Browsers
Java Plug-In 2 for NPAPI Browsers — from file “JavaAppletPlugin.plugin”.
application/x-java-applet
Basic Java Applets
javaapplet
application/x-java-applet;jpi-version=1.6.0_31
Java applet
application/x-java-applet;version=1.1
Java applet
application/x-java-applet;version=1.1.1
Java applet
application/x-java-applet;version=1.1.2
Java applet
application/x-java-applet;version=1.1.3
Java applet
application/x-java-applet;version=1.2
Java applet
application/x-java-applet;version=1.2.1
Java applet
application/x-java-applet;version=1.2.2
Java applet
application/x-java-applet;version=1.3
Java applet
application/x-java-applet;version=1.3.1
Java applet
application/x-java-applet;version=1.4
Java applet
application/x-java-applet;version=1.4.2
Java applet
application/x-java-applet;version=1.5
Java applet
application/x-java-applet;version=1.6
Java applet
application/x-java-vm
Java applet
application/x-java-vm-npruntime
Java applet
MoveNetworks Quantum Media Player
npmnqmp 071505000006 — from file “Move-Media-Player.plugin”.
application/x-vnd.movenetworks.qm
MoveNetworks Move Media Player Plug-In
qmx
application/x-vnd.moveplay1.qm
MoveNetworks Move Media Player Plug-In
qmx
QuickTime Plug-in 7.6.6
The QuickTime Plugin allows you to view a wide variety of multimedia content in web pages. For more information, visit the QuickTime Web site. — from file “QuickTime Plugin.plugin”.
application/sdp
SDP stream descriptor
sdp
application/x-mpeg
AMC media
amc
application/x-rtsp
RTSP stream descriptor
rtsp,rts
application/x-sdp
SDP stream descriptor
sdp
audio/3gpp
3GPP media
3gp,3gpp
audio/3gpp2
3GPP2 media
3g2,3gp2
audio/aac
AAC audio
aac,adts
audio/ac3
AC3 audio
ac3
audio/aiff
AIFF audio
aiff,aif,aifc,cdda
audio/amr
AMR audio
amr
audio/basic
uLaw/AU audio
au,snd,ulw
audio/mid
MIDI
mid,midi,smf,kar
audio/midi
MIDI
mid,midi,smf,kar
audio/mp3
MP3 audio
mp3,swa
audio/mp4
MPEG-4 media
mp4
audio/mpeg
MPEG audio
mpeg,mpg,m1s,m1a,mp2,mpm,mpa,m2a,mp3,swa
audio/mpeg3
MP3 audio
mp3,swa
audio/vnd.qcelp
QUALCOMM PureVoice audio
qcp,qcp
audio/wav
WAVE audio
wav,bwf
audio/x-aac
AAC audio
aac,adts
audio/x-ac3
AC3 audio
ac3
audio/x-aiff
AIFF audio
aiff,aif,aifc,cdda
audio/x-caf
CAF audio
caf
audio/x-gsm
GSM audio
gsm
audio/x-m4a
AAC audio
m4a
audio/x-m4b
AAC audio book
m4b
audio/x-m4p
AAC audio (protected)
m4p
audio/x-midi
MIDI
mid,midi,smf,kar
audio/x-mp3
MP3 audio
mp3,swa
audio/x-mpeg
MPEG audio
mpeg,mpg,m1s,m1a,mp2,mpm,mpa,m2a,mp3,swa
audio/x-mpeg3
MP3 audio
mp3,swa
audio/x-wav
WAVE audio
wav,bwf
image/jp2
JPEG2000 image
jp2
image/jpeg2000
JPEG2000 image
jp2
image/jpeg2000-image
JPEG2000 image
jp2
image/pict
PICT image
pict,pic,pct
image/png
PNG image
png
image/tiff
TIFF image
tif,tiff
image/x-bmp
BMP image
bmp,dib
image/x-jpeg2000-image
JPEG2000 image
jp2
image/x-macpaint
MacPaint image
pntg,pnt,mac
image/x-pict
PICT image
pict,pic,pct
image/x-png
PNG image
png
image/x-quicktime
QuickTime image
qtif,qti
image/x-sgi
SGI image
sgi,rgb
image/x-targa
TGA image
targa,tga
image/x-tiff
TIFF image
tif,tiff
video/3gpp
3GPP media
3gp,3gpp