Plug and Play Enumerator

Hi, a bit frustrated and needing some help. The problem I have is that I recently upgraded CPU/Motherboard, and had to repair my Windows XP. After the repair, everything worked fine, but windows update kept downloading/installing patches. Unfortunately, over the past day, after sp2 and various other patches were downloaded and installed, my computer has decided to lose functionality to my CD-RW, DVD, Creative SB card, and my modem card. Those items show up with a yellow mark under system devices, and with a message saying "device driver loaded but not started". In addition, under the system devices, the Plug and Play Enumerator has a yellow icon next to it. Further details say that the device driver can not be loaded because it is "missing/corrupted." A bit of research showed that the enumerator can be problematic, so I've tried to first uninstall it from the device list, then reinstall it with the "have disk" option. Unfortunately, the drivers for this are swenum.sys, and systemci.dll, both of which are available only on the windows CD-ROM. As I don't have functionality to my CD, I can't install fresh copies, only backup copies of those files that I've saved in an alternate directory (anyone have clean copies of those files?). With the copies I have now, every time I reinstall the enumerator device, a message pops up saying "can not load drivers, they may be corrupted/missing (code 39)". I don't know if this is a driver issue, versus a broader plug/play issue. Also, don't know if I can roll back to a pre-sp2 version. Any ideas? Research on the web seems to agree that fixing the enumerator tends to fix the other device problems. Anyone know how to troubleshoot the enumerator? Thanks in advance for your time!

System:
Intel P4 2.4C core. Abit IC-7 motherboard. 512gb PC3200 Ram, single channel.
Windows XP home edition. BFG Nvidia 6600 GT/OC AGP8x.