PLEASE HELP!! Windows XP problem!!

[Nikkicute]

I have windows.

When first logging on to my computer I get this:

16 bit MS-DOS Subsystem

C:\PROGRA~1\LEXMAR~\lxbbbmgr.exe
THE NTVDM CPU has encountered and Illegal instruction.
CS:054aIP:0101 OP:ff ff ff 99 ff Choose "close" to terminate the application.

I choose the close button.
Then I get:

MsnMsgr.Exe - Bad Image
The application or DLL C:\WINDOWS\system32\SensApi.dill is not valid Windows image.
Please check this against your installation diskette.

I click the ok button.
I have to click the button three times to get rid of it.

I can't get into my MSN e-mail or Windows live messenger.
When I try I get:

msmgs.exe - Application Error
this application failed to initialize properly (0xc0000005)
Click on OK to terminate the application.

I tried the SpyBot but that did not work.
What happened to my computer??

[regic]

Did you run an anti-virus scan yet?

[Nikkicute]

[quote author=regic link=topic=18609.msg73072#msg73072 date=1224709245]
Did you run an anti-virus scan yet?
[/quote]

Hi Regic,

If you could read through some of the thread on PSU where
I tried to get help but ended up a little confused at times.
http://www.powersellersunite.com/viewtopic.php?t=22750&postdays=0&postorder=asc&&start=0


Spybot - Nothing
C Cleaner - Nothing
Ad Aware - Nothing
Avast - Nothing
Norton Antivirus - Nothing (I'm not sure if I did this one right).

[regic]

I'd take the advice on this thread
http://www.bleepingcomputer.com/forums/topic173373.html

[Nikkicute]

[quote author=regic link=topic=18609.msg73074#msg73074 date=1224714117]
I'd take the advice on this thread
http://www.bleepingcomputer.com/forums/topic173373.html
[/quote]

Yeah that's me.
Do the Safe Mode?
Should I use the tool offered?