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How to downgrade from W2k SP4 to SP2?

I'm developping an app in Visual C++ that talks to the parallel port and I need to install a driver (port95nt.exe) that won't execute under SP4 on my main machine but will under my W2k Server machine with SP2. I have seen another case of a software that needed to downgrade from SP4 to SP2 to be able to use the serial port. Is this hard to do?....downgrade from SP4 to SP2? Thanks.
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pigeonbr

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Sorry about taking time to get back...thanks for the comments. I will study them and get back. Thank you all.