Computer hang at the time of boot menu

hello,

how r u ? i think you r very well..

Okey i have a problem with my desktop...there is a some problem with start up... when i turn on the switch of my CPU i have heard beeps of post but after some time boot menu appear and then i have selected window start normally it got hang.. i don't know what to do..


before half and hour i have start the computer it was start successfully...but after that the above error is still standing with me..Pls give me solution ..some hardware problem or Windows problem....


please reply is necessary