Flash is crashing both Firefox 2 & IE7

My system, Windows XP SP3, IE 7, Firefox 2.0 , Flash Player 9.0.124.0. After a
recent Windows update which included SP3 I had to install Flash Player latest
version for IE7. The normal Flash download and install wouldn't work. It caused
IE7 to crash repeatedly. Followed Adobe's online recommendations - uninstall
and redownload didn't work. Downgrading IE7 security to medium didn't work. The
Adobe Flash uninstall tool didn't work. Their final online solution (which
required several steps) regarding Windows registry permissions was successful
for IE7in my case: from the Adobe technote -

"Download SubInACL from Microsoft to fix permission issues that prevent the
Flash Player installation. For instruction on how to run SubInACL to fix these
permission issues please refer to "Download SubInACL from Microsoft to fix
permission issues that prevent the Flash Player installation" (TechNote
fb1634cb)."

Update - Now 6 days later and IE7 crashes have returned. No major system
changes or updates in that time. The IE7 crashes are most noticeable on Yahoo
sites ( Yahoo!mail for instance) when Flash ads try to load... Created a new
Firefox profile and that seems to have fixed the Firefox crashes, but wait and
see...