Not a Win 32 Application Error

Hi my windows XP computer says that the Win 32 application has failed to start and I face serious issue with my computer like it hangs .Becomes very slow at times when I open multiple applications and its totally weird to work with my computer with this trouble popping out every time .
I have also tried to clean up the virus using PC Clean Up software so hope that this problem may not be because of virus and I have also made sure that this problem did not arise after installing any recent software by removing them. From my side I have done all possible troubleshooting to fix this problem .But still no go .
Can anyone help me please
