orh i think i understand your situation le..
pai seh.
i tot u lost the recovery disc, so u installed another pirated os
cd on it, den u wanna restore it to the first original os
installation.
go buy a new cd better, the shops if they dun provide u with cd, it
may be corporate or pirated versions. either case, the license
don't belong to you.
den install it urself, very easy one. juz put in, reboot and follow
the on-screen instructions.