I'm really sorry, but I am having difficulty understanding the problem. Your post is very muddled and it is not easy to read.
Here is what I think you have said;
1] Your computer hard disk had 2 partitions.
2] You have erased an Operating System, (OS), from one partition using a program called "Secure Erase". Did you use this program to erase the data from both partitions?
3] You tried to make one partition with "Partition Commander", but both(?) programs do not do that? Sorry, I don't know what you are saying here.
If you used "Secure Eraser" simply to erase the data from one or both partitions, surely the original partitions remain? If so, why try to create yet another partition?
4] You are trying to install a new OS, but keep getting a message during setup that there is already an OS installed. Which OS are you trying to install? Do you have the correct setup CD's for this OS?
5] The PC aborts the setup. What error messages do you get?
If I have missed anything, or got something wrong, please say what I have missed or misunderstood.
I have a pc (I think a got a virus) I erased the hard drive using "secure erase" y I tried to make one partition with
"partition commander" but both programs don't do that suppostly must to do now somebody recomended "drive erase". (I'm not sure to buy it)
(the problem is that my pc doesn't format the hard drive completely y have one with 160 gb and recognize 131gb only. and when I try to install a new SO the pc give a message (one SO is installed in your computer_before I had installed xp and now I want to install win 95 and upgrade with winMe.
but I cannot do it, because the pc abort the setup. How I can have acces to the whole hard drive erasing partition and programs even SO.
Thank for the answer.