Hello, I am going to be getting Vista soon and I want to install it over my PC with windows XP to fix a few problems, however my XP PC has run into a few problems

1. I had a big Malware and trojan problem and my anti-virus deleted the userint.exe and that caused an auto-login logoff loop, and I couldn't fix that since my PC didn't come with a Windows XP CD.

2. My dad was screwing around with Harddrives on that computer trying to think of his own half-crapped way to fix it by using a different harddrives, only to find out all of these harddrives were messed up in one way or another. When he put it back together it now says disk boot failure, please insert boot disk. I don't have anyway to get past this seeing as we don't have any cd's to use to get past that (I heard you could create a boot disk on another pc with a burner and a similar version of XP, however the PC I am using has Windows 98, and no burner.) I think that may be because of the one drive being plugged back in wrong because the first few times he tried the computer shut down as soon as it turned on.

3. I think the computers files are still screwed up and infected

I want to know if I can fix this by somehow installing Vista, or would I have to get past the boot disk part to install it? I really don't want to have to buy Xp and Vista and I don't know anybody who would lend my a copy of XP. Can anyone help me with this? I would appreciate it.

(Just so everybody knows, I am not trying to get Vista on a PC with Windows 98, I am just using this PC in the meantime until I can fix the above problem. The corrupt PC has a Dvd Burner, and meets the requirements of Vista.)

Configuration: Windows 98 Internet Explorer 6.0