BSOD error on NT4 server

I have justed installed post SP6a patches on 2 NT4 servers (never been patched). Each set of patches required installing seperately.One server was done as was ok. The second server had a BSOD error after installing second patch (prob was Q299444). I came up with KMODE EXCEPTION NOT HANDLED 0x0000001E (0xC0000005 etc) on ntoskrnl.exe just after the Logon screen appeared.

I managed to get hold of some ERD disk, I had to add a ADPU160M.SYS driver to disk set to recognise Hard disk. Now I replaced the ntoskrn.exe with one from SP6a. Still BSOD’d.
Then I tried to uninstall Q266444 by copying the files out from the $ntuninstall dir into c:\winnt\system32 but still no go.

Any ideas?