Did your laptop come with a restore disk to take it back to the
condition it was in when you bought it (that's what those disks do)?

You will lose all the changes you made to it, plus all your data, but
it is probably the best of all possible alternatives.

You have three choices:

1. You can go through the usual virus/malware removal steps, either by
yourself or with guided help.
http://www.elephantboycomputers.com/page2.html#Removing_Malware

2. You can take your computer to a competent local computer professional and
have them clean it. Don't use one of those BigComputerStore/GeekSquad type
of places. You need to be aware that not all local shops are skilled at
removing malware and even if they are, your computer may be so infested
that Windows will need to be clean-installed. If possible, have all your
data backed up before you take the machine into a shop.

3. Back up all your data and do as Nonny suggested and use whatever method
provided by the laptop mftr. (look at its manual or their website or call
them if you don't know how) to return the machine to factory condition.

Malke