When i open some programs, example "Yahoo messanger" My sytem hang and when i see at Task manager, CPU usage is 100% may i know what is the reason and how to rectify?
Try to reboot your system in safe mode. (Start windows and press f8 for a long time until you can select it) after you boot in safe mode. Open Start -> Run -> Msconfig. If you have that opened you can select in the last tab which programs you want to start when windows boot. De-select the yahoo messenger. After a reboot de-install Yahoo Messenger. Reboot again. And install it again. Probably this will work. Good luck.