Problem upgrading Vista laptop to IE 9

I have a laptop running Vista Home Premium, service pak 2 with latest critical upgrades also installed. Also IE 8 installed.

I just tried several times to install IE 9 and each time the upgrade stalls with the message "IE 9 installation has stopped running ". There is a troubleshooting link to Microsoft web site with a list of things to check as being properly installed and upgraded including have Vista at service pak 2 and all latest downloaded upgrades installed, which as I note above I have already done.

• Added note, my default browser is Firefox which I at first used to download the IE 9 installer link "” NOT the full install binary file.

Then it occurred to me to download through IE 8 which, of course, MS site prefers and which gave me the full binary file not just the small upgrade link through Firefox.

I DID NOT TRY INSTALLING THIS FULL BINARY FILE THROUGH IE 8 FOR THE FOLLOWING REASON:

I.e., I had already tried an IE 8 downloaded full binary file several months ago when IE 9 first became available, (which I assume would have been less upgraded compared to this present version). This earlier try resulted in a locked up or corrupted, unusable IE 9 version which I had to uninstall and which kicked me back to IE 8. So I am leery of presently trying another installation of this present IE 9 binary file.

Anxiety about past experience notwithstanding, I would like to do the right thing and upgrade Vista to IE 9.

Any tips, work-around tricks or advice anyone can offer here would be most appreciated.

Thanks very much for your time and attention,

Timothy