dont know if any of this applies to your issue.
I toasted the OS on my server while trying to add the 'quick launch' toolbar
after installing ie 5 then 6. (tried several options then went for the "dont
try this unless all else fails" instructions)

system info
dell d300
1 - 4 gig and 1- 120 gig standard hard drives
nt 4.0 sp 6

so
I just rebuild my nt server last night.

things that I ran/run into.
1) the install of NT 4.0 from the base CD ( service pack < 3)
does not install on to drives > 2 gig ( it does but wont boot to finish the
install).
so I have to partition my 4 gig drive into 2 - 2 gig partitions.

2) Also the 120 gig drive on this server showed up  but it would not
function/display the drive contents until I install  SP 6  then it opened and
all my data was there. (sp 3 or 4 does not seem to reconize the drive, did
not have sp 5 but sp 6 worked)

3) I put very little on the C drive in case I hose the OS. ( I play alot
with my systems which end in a rebuild, ( thank God for test servers.)

4) if you want the 'quick launch' toolbar, load ie 4 and use full/custom and
answer yes to "make the desktop look like this") correct it later to remove
the channel , chat and other options you dont want, much easier than try to
install ie4 with the standard or "pick and choose" option and find the quick
launch did not install. ( you then you can upgrade to ie 5 or 6)

5) if you want IIS 4 ( IIS 3 is standard for NT and does not come on the
SPs) - install from nt4 option pack.( dont think ie 5 or 6 affects the
install) MS still has the modules on a web site but they are not one download
but about 50 .
this is the link to the option pack download site.
http://www.microsoft.com/downloads/details.aspx?FamilyID=05c301d2-51f6-4cc1-b750
-02f3c3141a71&displaylang=en
( I burned them to a cd and installed for there)

HTH

Tim