What is SP4, RC 3.154??

[Tech@college]

I have installed SP4 on all computers in my dept. on one
of these in My Computer-Properties, it appears as Service
Pack 4, RC 3.154 On all of the others it is simply
Service Pack 4.
I have searched the web for references to this RC 3.154
and have only found one or two answers in German.
Does anyone know what this is, is it a valid update or
version of SP4???
The computer in question was recently hacked and external
telnet software was found and removed, and it is now
constantly receiving the Nachi virus (despite being
patched) I'm wondering if any of this is related, but my
main concern is what is RC 3.154? Any info would be
greatly appreciated.
Also when I install any Microsoft Updates on this machine
it consistently reboots.

 

[Guest]

It is the version release for service pack 4. It defines
what particularites or changes added to that service pack
after its initial release.

 

[Guest]

I used the same disk to install on all other machines but
only this one has the RC 3.154 every other machine just
says Service Pack 4.
Is it possible for a hacker to make changes to SP4 to make
their future access to the machine easier and would this
explain why after installing any Microsoft Automatic
Updates the machine continually reboots?