Hotfix for Windows XP KB954550-v5

I have a Windows Server 2003 SBS.

Yesterday I installed, according to recommendation by Windows Updates:

a. Hotfix for Windows XP KB954550-v5**
b. .NET Framework 3.5 SP1 and .NET Framework 3.5 Family Update
for .... KB961847.

I didn't realize it's "for Windows XP". Anyway, the first one went
through**. The second one failed.

(**I am assuming this was the patch I installed by looking at Control
Panel Add/Remove Programs. I didn't notice it while installing.
However, Windows Update website history does not list this patch. In
other words Add/Remove Programs is different from Windows Update web
site.)

After rebooting, it looked ok. And then I retried the second patch
again today. It failed again. The logs say it is not installed. But
now, the server now is totally unstable. It may suddenly freeze after
some minutes or after some hours. No error message, no BSOD. It just
freezes.

What can I do? Is the Hotfix for Windows XP the problem? Why is an
XP patch appllied to my Server!!!?

Thanks