Annoying Vista Hang at Logon

On a regular but random basis (approx 3 of 10 boots), I'll enter my
logon password and then, when the "Welcome" text appears, it will just
sit at that point & hang indefinitely with no message or other
result.  After waiting anywhere from a few minutes to 15 minutes, I
can force it along by either pressing the Enter key or Ctrl-Alt-Del.
Usually it requires a Ctrl-Alt-Del which brings up the Task Manager
and than I cancel out of that to get to the Explorer Desktop.

Here's my sysinfo and startups - any advice appreciated.


OS Name Microsoft® Windows Vista™ Ultimate
Version 6.0.6000 Build 6000
Other OS Description    Not Available
OS Manufacturer Microsoft Corporation
System Name     MARKVISTALAPTOP
System Manufacturer     Dell Inc.
System Model    MP061
System Type     X86-based PC
Processor       Genuine Intel(R) CPU           T2250  @ 1.73GHz, 1733 Mhz, 2
Core(s), 2 Logical Processor(s)
BIOS Version/Date       Dell Inc. A06, 12/18/2006
SMBIOS Version  2.4
Windows Directory       C:\Windows
System Directory        C:\Windows\system32
Boot Device     \Device\HarddiskVolume2
Locale  United States
Hardware Abstraction Layer      Version = "6.0.6000.20500"
User Name       MARKVISTALAPTOP\Mark
Time Zone       Eastern Standard Time
Total Physical Memory   2,045.82 MB
Available Physical Memory       1.14 GB
Total Virtual Memory    4.20 GB
Available Virtual Memory        3.11 GB
Page File Space 2.29 GB
Page File       C:\pagefile.sys


AVP     "c:\program files\kaspersky lab\kaspersky internet security
6.0\avp.exe"       Public  HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Broadcom Wireless Manager UI    c:\windows\system32\wltray.exe  Public  HKLM
\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
ehTray.exe      c:\windows\ehome\ehtray.exe     MARKVISTALAPTOP\Mark    HKU
\S-1-5-21-3145894094-2871179407-222814134-1001\SOFTWARE\Microsoft
\Windows\CurrentVersion\Run
FveNotify       %windir%\system32\fvenotify.exe Public  HKLM\SOFTWARE
\Microsoft\Windows\CurrentVersion\Run
MSConfig        "c:\windows\system32\msconfig.exe" /auto      Public  HKLM\SOFTWARE
\Microsoft\Windows\CurrentVersion\Run
NvCplDaemon     rundll32.exe c:\windows\system32\nvcpl.dll,nvstartup
Public  HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
NvMediaCenter   rundll32.exe c:\windows
\system32\nvmctray.dll,nvtaskbarinit    Public  HKLM\SOFTWARE\Microsoft
\Windows\CurrentVersion\Run
NvSvc   rundll32.exe c:\windows\system32\nvsvc.dll,nvsvcstart   Public  HKLM
\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
RoboForm        "c:\program files\siber systems\ai roboform
\robotaskbaricon.exe"      MARKVISTALAPTOP\Mark    HKU
\S-1-5-21-3145894094-2871179407-222814134-1001\SOFTWARE\Microsoft
\Windows\CurrentVersion\Run
Sidebar c:\program files\windows sidebar\sidebar.exe /autorun
MARKVISTALAPTOP\Mark    HKU
\S-1-5-21-3145894094-2871179407-222814134-1001\SOFTWARE\Microsoft
\Windows\CurrentVersion\Run
SynTPEnh        c:\program files\synaptics\syntp\syntpenh.exe   Public  HKLM
\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Windows Defender        %programfiles%\windows defender\msascui.exe -hide
Public  HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run