Windows XP no longer allows the dual core cpu to work together

Among the recent windows updates (I think around October) caused my AMD core 7750 dual processor no longer work together.  What I mean by that is that when I use an application heavy processor as an anti-virus or a game it will allow only this program to use 50% of the total of the processor, when I use two of them at the same time, then windows allocates the other processor to the second task, also sometimes when you check the Task Manager I see that the CPU usage is 50% and has a 99% system idle process.  After Reinstalling windows xp processor works as it is supposed to, but I don't know what update is the cause of the problem, but it seems to happen after I get a rundll32 error if that helps any.

I managed to fix it but I don't know exactly how, all I know is that the problem went away after I reinstalled windows xp again.

Tags: Windows

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