A8V-VM SE USB Issues

Since you guys are all kinds of awesome, and you totally solved an issue I had a while ago, I thought that I'd give it another shot, and see if you can figure out the *other* computer issue that's been plaguing me since I got my system almost 2 years ago.

I have 6 USB ports on my PC, 2 in the front, 4 in back. Unfortunately, how well they work is sporadic, at best. On the front panel, one post works, and the other doesn't. End of story. Again, in the back ports, one cluster of 2 work (the bottom ones), and one cluster of 2 doesn't (the top ones).

They're all USB 2.0 (or they certainly should be >.< ), but even that is sketchy. Sometimes when I plug devices in, I get the Windows warning message about "This device can perform faster if it is inserted into a Hi-Speed USB 2.0 Drive", and sometimes I don't. Most of the time, the device behaves sporadically, dinging in and out of Windows and interrupting any data transfer I'm doing.

Physically, there seems to be nothing wrong with them, and I don't even touch the cord or device, when suddenly it disappears from My Computer and re-appears a second later.

Running an Sempron 2000+ on an Asus A8V-VM SE mobo. Here's a picture of what it looks like in device manager.

Any help would be much appreciated.