Hi my friend was mucking around with his computer and he found a program in the add/remove programs section, it was called 'NAVHELPER' he removed it and after he did his computer will boot to the login screen and then it reboots.
I turned off the restart on sytem failure and this is the stop error message.

RDR_FILE_SYSTEM

(The usual stuff here)

STOP: 0x00000027 (0xBAAD009C, 0xF8B7960c, 0F8B79308, 0xF6658E0A)

udfreader_xp.sys Address F6658E0A base at F662B000 date stamp 3e81fc4f

Any ideas,
We can get into "safe mode"
We tried sfc /scannow
We tried booting from the CD and using the repair option "R" and typing at C:\windows\system32 copy userinit.exe wsaupdater.exe
Tried Systen restore but it keeps saying it can't restore the date we specify.
Please any help would be appreciated.
Dave & Jay