Spyware popups?

My computer start showing me annoying
popups

Internal System
Error
Errors in system registry were
found.
KL0x010013DB SYSC: 1f SYSLVL
0xe615025
NTKernel error 7645 (unhandled
exception)

A system is
unstable
An error has been detected and Windows has been shutdown buggy
application to prevent damage to your
computer.
NTLDR - Address C8D460BA base at D00010, DS 76a032B3 KDbg: COM1 (Port
0x38f, Baud rate
192000)

Critical error
occured
SEGFAULT: 0x100B05E (0xA502D4, 0x00100,
0xBC0D36)
Inaccesible handler or
device.

IEXPLORER.EXE - Application
Error
The instruction at 0x02b52a37 referenced memory at 0x0a554d67. The
memory could not be
read.
Click on OK to
terminate

....

and
others...

Is it spyware? What is it and how to remove this :-( Plz, help!!
.