Potential Issue with P3 Profiler

I install plugins that seem interesting, play with them for awhile, and then move them to a /plugins-archive directory. I regularly rename directories, and Update my archive.

Recently, I butter-fingered the clean-out operation. Normally, I Deactivate All Plugins, log out, move plugin subdirectories between directories as desired, log back in, and Activate All Plugins. In the midst of the routine, I 'spaced out' and performed a spurious Deactivate Plugins, while they were all deactivated.

Next thing I know, I have a white screen, bearing the message: Warning: Unknown: failed to open stream: No such file or directory in Unknown on line 0

Fatal error: Unknown: Failed opening required 'C:\wamp\www\wp3\wp-content\plugins\p3-profiler\start-profile.php' (include_path='.;C:\php5\pear') in Unknown on line 0

I then could not bring up my site at all, getting only the white-screen msg.

Research yields references to (among other things) the .htaccess file. That's an easy thing to check (on my WAMP Server localhost), esp. since I do nothing with htaccess. Oh - it contains: # BEGIN p3-profiler
php_value auto_prepend_file "C:\wamp\www\wp3\wp-content\plugins\p3-profiler\start-profile.php"
# END p3-profiler

Just those 3 lines in htaccess. After deleting them my page came up normally, no errror msg, and I logged into Admin ok. Everything appears to be fine.

If this incident seems of interest or importance, I will try to recreate/document it.