While a "disk boot failure" can occur from a corrupt windows installation (in which case a full system restore from an image or restore CD's may solve your problem), it is often a sign of imminent hard drive failure and the hard drive should be replaced as soon as possible.
If you don't need to or don't want to save anything, then just reformat the hard drive and run the system restore CD's (or DVD) from HP that came with your computer. If you didn't receive any CD's or DVD's with your computer for restoring your computer, the files are on the computer and you have a utility from HP that will allow you to make restore CD's. You can find this on your start menu - program files. If using CD's you may need as many as six or seven blank CD-R CD's (do not use CD-RW disks).
Since your computer is probably still under warranty (unless you only got a 90-day warranty), your hard drive should be able to be replaced at no cost to you. If you bought the computer at a store, like Best Buy or Circuit City, they can do this for you, but don't do this yet if you want to save any of your data. To save your data, read on.
Before you start, gather up all your installation CD's from HP (or the ones you created) and any other software you've installed. If you downloaded software from the internet and the installation files are still on the computer (look on the desktop and any folder labeled "download" or "my downloads". Copy these also to a flash drive or CD. Print any email messages from purchased software that list your logon, password, product or activation keys.
If you want to save email, email account data, or favorites, you can do that also.
If you're using Outlook, your email files and data are contained in an outlook.pst file, which by default is located in C:\Documents and Settings\[your user name]\Application Data\Microsoft\Outlook\. Copy this file also. This folder is normally hidden, so you may need to go to My Computer - Tools - Folder Options - View. Under "advanced options, check the button that says, "Show Hidden Files and Folders". When you restore your PC, you will use this file to re-import your email, calendar and contact data.
If your operating system is Vista, your mail may be Windows Mail, which replaced Outlook Express. Your email will be in a folder called C:\Users\[your user name]\AppData\Local\Microsoft\Windows Mail,
but it will probably be easier for you to export your mail and contacts. Open Windows Mail and under the "File" menu, select "Export". For contacts use the CSV format and browse to your Documents folder for the location. Select all fields you wish to export. Do this again for your mail. Choose Windows Mail as the format and navigate to the location you wish to save the mail in (I recommend the Documents folder)
Next, copy all your pictures, documents, music and any other data files you wish to keep to a flash drive or CD or both. Depending on the amount of data you've accumulated in the six weeks you've owned the computer, you may exceed the capacity of a flash drive and may have to burn several CD's.
Once you have all your data backed up, you can reformat your current drive (though I still recommend replacing your hard drive) and reinstall your operating system plus all programs and data. Reinstall any antivirus and antispyware applications you may have and enable automatic updates from Microsoft. Go to Windows Update and download all critical updates for your operating system that are available for you.
If you're not comfortable with doing any or all of this yourself, I recommend you contact a local PC technician to either assist you or do it for you. If you want to save and restore your data as described above, make sure you stress this with the technician so there are (hopefully) no unpleasant surprises.