Comtrol RocketPort 550 uPCI Windows XP - Manual (Page 25)

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3.1 Using Windows explorer open the folder
WINDOWS\system32\drivers
3.2 remove the following files
RcktMf.sys
RcktMfuf.sys
RcktSer.sys
3.3. Locate the folder containing the driver installation files. This is the
folder to which the files were extracted to from the distribution file
WinXPdrv.exe
It makes sense to leave this folder intact unless the R550 /BP550 driver is
never going to be reinstalled in which case delete the contents and the
folder.
4. Removal of Registry Entries
I have found that it is not absolutely necessary to remove the registry entries
for the R550 / BP 550 driver as I have found that they do not affect
subsequent because they are merely overwritten.
However if you really must then:-
4.1 Run regedit
4.2 expand the registry tree
HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services
4.3 Remove the following subkeys
Rckt550
RcktMf
Rcktmfuf
The driver files (.sys) and setup information files (.inf and .PNF) are now
removed. After restart, assuming that RocketPort/BroadPort 550 and/or
RocketPort/BroadPort 550 Universal cards are physically installed then
Windows XP will detect these cards as new hardware and initiate the ‘Add
New Hardware’ wizard.