Occasionally you get problems that make you really say to yourself WTF???.
After having succesfully migrated DHCP from Server 2003 to Server 2008 R2 SP1 for over a hundred subnets, I get a call saying Ricoh printers on two of the subnets can no longer get an IP and are defaulting to 184.108.40.206.
Other brand printers, the computers, etc, were all correctly picking up an IP address, just not the Ricoh's, and just on those subnets, even though they were set to DHCP.
After trying various things without luck, I noticed that the affected subnets had a BAD_ADDRESS 'This address is already in use' entry imported over the old servers. After deleting the entry and rebooting the printers, they all picked up their reservations!
The bad IP and MAC did not look similar or have any obvious relationship with those not working, but never the less, removing it fixed multiple Ricoh printers on that subnet.
Installed Windows 7 64-bit on an old Novatech / Clevo laptop, made when Vista was out. Windows automatically installed a driver, but the integrated microphone did not work.
Installed the latest Realtek audio codec driver, which made the microphone work, but now the sound was distorted, like speaking into a fan. Reducing the quality from DVD 24-bit to CD 16-bit changed the distortion into lots of crackles, pops, and other static noises.
Tried an old official W7 driver from the Clevo site, but still the same problem. Dug out the original driver CD with R1.91 drivers, but the setup.exe was designed for Vista and refused to install.
Went into Device Manager, chose Update Driver on the 'High Definition Audio Device' and pointed it to the Vista64 folder within the Realtek drivers, it installed, and everything worked perfectly.