I have a very weird problem wiht my Vista Ultima x64. When I connect an USB flash drive to any USB port on the system it installs the drivers the first time i plug it in, the drive letter appears, the autoplay menu pops ups, and the it disconnects and connects again. If I use an MP3 player, it restarts, as if it were plugged off an on. I am using a C2D 8400 on an Asus P5N-e SLI bios version 1002, 4GB supertalent DDR2 800. It´s not a motherboard/chipset issue because the same thing happened with the exact same setup but an Asus P5KSE motherborad wich i swapped with the P5N-E SLI. It seems to happen with non-powered Drives, because I have an external USB hard drive with its own power supply that works, and my Nokia N91 cellphone works too. Any ideas?