Dreamweaver has stopped responding

Hello - I have hit a major problem. This request for help is a bit long winded but I believe the sequence of events are important, to whoever can help, in understanding what has happened to cause the error
System: Windows Vista, Dreamweaver CS3, with following extensions added. Contact Form, CSS MenuWriter, Data Assist, Digital File Pro, eCart, Security Assist
Background: I built a php site using Security Assist and everything was working fine using the local testing server. When I added a new page and modified the Security Assist I got an error (very long and can't recall what was in it) so I deleted the page. When I attempted to view the index page in the browser I got an error message indicating the Menu was not working so I opened the template and edited the menu and saved again, everything seemed to work OK. I created a new page again applied security assist to the page - it worked OK and I could preview the page fine on local host.
Having checked a couple of other pages on localhost all seemed well so I modified the database connection file for the live server and published the site. However all the live site would do is load the index page and non of the links worked and I received an error message that the live connection to the database connection file was not working. Also when attempting to open live simple pages I received an error message (can't recall the message) that indicated the Menu was not working and the page loaded without the menu displaying the error message.
Next sequence of events
1 - I went back to Dreamweaver and re-instated the local host database connection and checked that it worked OK by displaying pages on local host.
2 - I then opened the template to verify the menu structure but the Extension would not load and Dreamweaver stopped responding.
3 - I forced DW to close using Task Manager, restarted and opened the index page, attempted to launch another extension (Security Assist) but the extension did not start and DW stopped responding.
4 - I forced DW to close and restarted. DW opened and the WA Momento screen loaded the DW stopped responding.
5 - I deleted the WinFileCache.dat file as indicated in the help file
6 - Launched DW, - the WA Momento page opened the DW stopped responding.

7 - Thinking that this might be a site error (DW is set open into the last site worked on) I backed up the site into a Zip file and then deleted the original site on my computer.
8 - Relaunched DW - the WA Momento page opened the DW stopped responding
9 - checked for the WinFileCache.dat but it has not been re-created, presumably because DW stops responding?

So I am at the stage where I cannot use DreamWeaver and because it stops responding, I can no longer open any pages and I cannot uninstall the extensions.
I used a stand alone FTP application to delete all the files on the remote server
What steps can I try next to get DW working again?
Don