Kernel Stack InPage Error

You've listed a lot of various issues which don't bring to mind any one solution (except that proposed by Dena).  I would add to that and say that if chkdsk DOES find some substantial corruption (especially if it can't fix some of it), you should run a full diagnostics scan of your hard drive. 

You mention getting a BSoD.  Here's an article on that specific error (but it involves hibernation so I don't know if it applies to you - but the solution may still work):http://support.microsoft.com/kb/956871.

This type of error often occurs because of a hardware or device driver issue. Go to Device Manager by going to start / search box and type device manager and enter and then double-click on the program icon that appears.  Check each device for a red x, yellow ! or white ?.  These identify devices with problems (probably drivers, but also conflicts or something else).  Click on each for further details and troubleshooting tips.  If you need to get drivers (and it wouldn't hurt to update all your drivers just to remove this as a potential cause), do so from the computer vendor or device manufacturer (NOT from Microsoft Updates).  In fact, you should turn off automatic driver updates from Windows Update as follows: http://www.addictivetips.com/windows-tips/how-to-disable-automatic-driver-installation-in-windows-vista/. Please do this now while you're thinking about it so you don't forget to do it later.  Proceed as follows to get the drivers:http://pcsupport.about.com/od/driverssupport/ht/driverdlmfgr.htm.  Once you have the drivers, you can install them through Device Manager as follows:http://www.vistax64.com/tutorials/193584-device-manager-install-driver.html.

Read the posts by Spirit MVP in the following thread regarding the Blue Screen of Death.  They may very well help you resolve or at least identify your problem:http://social.answers.microsoft.com/Forums/en-US/vistahardware/thread/8cd8362e-7d06-46fb-afd7-84d54b6a8ea7.

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If the above doesn't work, then I'd suggest a general troubleshooting procedure to try to resolve or at least identify the problem or problems:

If that doesn't work, then please post any repeating error messages from the Event Viewer concerning startup (Start / Control Panel / Administrative Tools / Event Viewer – or typing eventvwr from the command prompt).  Here's how to use Event Viewer:http://www.petri.co.il/vista-event-viewer.htm.

You may be infected with malware despite the scans you have run (no program catches everything). Try to run anti-malware programs (in safe mode with networking if necessary). To fix this problem (if it is a problem) download, install, and run the following two programs:http://www.malwarebytes.org/mbam.php andhttp://www.safer-networking.org/en/index.html.  You may also want to try a free trial of Pandasoft (http://www.pandasecurity.com/usa/homeusers/solutions/global-protection/).  Before downloading pandasoft, uninstall whatever anti-virus program you are currently using (because installing and running two at the same time can cause conflicts, freezes, and all sorts of problems).  Once you've uninstalled your current AV program, download, install, update, and scan using Pandasoft.  I think you might be amazed at how much it finds that the other software missed.  Once complete, uninstall pandasoft and re-install your current AV program (unless you decide to switch which I did when I first tried it about 4 years ago).  You may also want to try the new, free Microsoft Security Essentialshttp://www.softpedia.com/progDownload/Microsoft-Security-Essentials-Download-131683.html(with the same caveat that only ONE AV program can be installed and running on your system at any one time). You may also want to try the free Avira at:http://www.free-av.com/ and Avast at: http://www.avast.com/index. Reboot after completing all the scans. You may also want to try the free OneCare athttp://onecare.live.com/site/en-us/default.htm and let it run all the options (except the registry cleaner) because that’s good maintenance (it will take some time to complete but can be done in the background). 

If that doesn't work, we'll need to do a system repair/upgrade using the genuine Windows Vista Installation Disk (one you own or one you can borrow from ANYONE).  Here's the procedure:http://www.vistax64.com/tutorials/88236-repair-install-vista.html.  Although this will not affect your data, settings, or programs, you should still backup your data before starting just to be on the safe side. If the other procedures don't work, THIS one is almost certain to work.  You may have a lot of updates to re-install (including any service packs you had to remove).  If the version on the system came with SP1 or SP2 pre-installed and the disk is an earlier version, then you'll need to make a slipstream disk as follows:http://www.vistax64.com/tutorials/151606-vista-sp1-slipstream-installation-dvd.html.  

Hopefully one of these procedures will resolve your problem.  If not, post back and we'll try something else.  Post back in any case so we'll know how it turned out.

I hope this helps.

Good luck!