Trouble after 4.09m install

[woodchuck]

I've been running 4.08m for awhile now with no problems.

I downloaded the 4.09m beta and unzipped into my
C:\Program Files\Ubisoft\IL-2 Sturmovik 1946 folder.

I didn't (drat!) back up first.

Then I also went right ahead and unpacked the .rar file for the 4.08_to_4.09b_switcher called Switcher for Smog that I got at Mission4Today.

Although the Switcher seems to work ok, the program dies out after a few seconds of the splash screen, just long enough to read that the version # changes.

Intel Core2duo @ 2.13Ghz
2 GB ram
SLI 2 GeForce 7600GS
Windows XP