Help with IBM personal Computer,recovery disk

Maven13

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May 23, 2007
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When trying to wipe clean the hard drive,the recovery disk prompts me to type agree,then hit enter,and it then says it has received a bad command,after it commands you to do what you just did.
Got the trojan from hell, and now I just want to install Windows XP, but when trying to install,it copies the windows ,and now...there is no room left for error.
Please help me?
The Divine Miss M.