I have a trojan (backdoor I'm pretty sure) and I think I got rid of it but to make sure I wanted to wipe my hard drive. Will what get rid of it for sure? Also is there any programs you recommend to do the job? Thanks in advance.
You can go to one of the malware forums like http://www.bleepingcomputer.com to get help
or read this:
Wipe Hard Disk Completely... help with reformatting
http://www.bleepingcomputer.com/forums/topic250729.html
wiping the hard drive will also erase your recovery partition. you will need to buy recovery discs, which you should have made with the provided software when the machine was still good.
here is a link to help you get them.
http://jesusnjim.com/pc-repair/computer-parts-and-how-i-find-them.html
if you can manage to format the machine using the recovery partition (sometimes this requires the ability to boot semi-normally with F8), this may solve your problem.
an OS Repair will not do the trick.
http://Jesusnjim.com/pc-repair/format-computer-to-factory-state.html