Please post your system specs, we have no idea what you're working with.
Does your system have at least 1GB RAM but less than 4GB? Do you have an IDE or SATA hard drive? If it's a SATA drive, do you have the SATA drivers & a floppy drive to load them? If not, there are a couple of workarounds, but there's no point getting into it until we know what you have. Also, do you have all the device drivers you'll need?
If you have a store-bought computer & you didn't wipe out the Recovery Partition, there's most likely a key (or keys) that can be pressed at startup to do a factory restore. You'll lose all your files & programs in the process though & you'll be stuck with all the OEM bundled crapware again.
message edited by riider