So, once making the change in paragraph 2, never try to go from maximum processors to less than maximum or that’s what you’ll be stuck with. Edit to 4 and 4 will be the norm from now on. Go into MSCONFIG and check the box you unchecked previously, click on the drop down menu and you will see the option for 1-2-3-4 processors. Windows will now use all 4 processors on startup. Then go to MSCONFIG, BOOT, ADVANCED and remove the check in the box above number of processors, graying it out, and restart Windows. Edit number of processors to maximum number (4) and OK.
To correct, and get all 4 processors working again, first go to CONTROL PANEL, SYSTEM AND MAINTENANCE, ADVANCED, ENVIRONMENT VARIABLES. Once the number of processors is set in MSCONFIG (BOOT, ADVANCED) from 1 to 4, you cannot go backwards, say to 2, because Windows Vista will then only use 2 processors after boot up, and NO OPTION IS PROVIDED TO GO BACK TO 4, only 2 will show in the MSCONFIG, BOOT, ADVANCED drop down menu and Vista will only use 2 of the 4 processors from then on. Go back into MSCONFIG and check the box you unchecked previously, click on the drop down menu and you will see the option for 1-2-3-4. Windows will now use all 4 processors on startup and after startup. Then go to MSCONFIG, BOOT, ADVANCED and remove the check in the box above number of processors, (graying it out) and restart Windows. Once the number of processors is set in MSCONFIG (BOOT, ADVANCED) from 1 to 4, you cannot go backwards, say to 2, because Windows Vista will then only use 2 processors, and NO OPTION IS PROVIDED TO GO BACK TO 4, only 2 will show in the MSCONFIG, BOOT, ADVANCED drop down menu and Vista will only use 2 of the 4 processors from then on. You can change this in msconfig so that Windows 7 sees how many processors you have at startup. That strikes me as being wrong if, like me, you have a Core 2 Dual processor.
In msconfig Vista is set by default for 1 processor. WRONG! What I managed to do is lose the use of 2 of the 4 processors!
I tried to make a change again, going from 4 processors to 2 processors at boot time.
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