That's strange that you didn't get a reinstall disk. There should at least be a License Key sticker somewhere on the PC case. IIRC, that represents your legal entitlement to use the software, or something. It doesn't matter how you get the installation media. If you could pull down an OEM edition of Windows XP (Home?), chances are that license key would work to activate it.
Kaspersky is something of a resource hog. If you're on that old a machine, you'd be better off running Microsoft Security Essentials. It'll do most of what you need and is free (as in beer).
Outside the box, maybe you might want to give Xubuntu Linux a shot. It works well with low-power PC's... I've run it on things with less go that your desktop quite happily. I think you can run Starcraft in WINE, and you won't need an antivirus or anything like that. Best of all... it's Free.
________________________________
--m(^0^)m-- Wot, no sig?
Kaspersky is something of a resource hog. If you're on that old a machine, you'd be better off running Microsoft Security Essentials. It'll do most of what you need and is free (as in beer).
Outside the box, maybe you might want to give Xubuntu Linux a shot. It works well with low-power PC's... I've run it on things with less go that your desktop quite happily. I think you can run Starcraft in WINE, and you won't need an antivirus or anything like that. Best of all... it's Free.
________________________________
--m(^0^)m-- Wot, no sig?