registry error ???

On abit BD7II-RAID mobo with a P4 2.2 Ghz processor and 512 Mb DDR266 RAM. I receive the following error when trying to instal the Intel chipset drivers for its 845E chipset. Memory controller hub 82845E
I/O controller hub 82801DB (ICH4)
Error Quote:
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Either sourcePath or WinDir values in HKLM\\SOFTWARE\\Microsoft\\currentVersion\\Setup key does not have a drive letter. Registry is currupt! Installation aborted.
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