Try this:
U could also try fixing the present Win. Boot from the Win CD and do like if u were going to a install. DO NOT USE THE REFORMAT OPTION. Just follow instructions and it will get to a fix this install option. Choose this option and like it run. It will take about 30 mins for this fix. Write back and let us know?
PS do not use the manufacturers (emachine) CD. It has to be a Win CD SP2 or SP3.