It can be very difficult, if not impossible, to try to troubleshoot multiple problems at the same time---especially if they are interrelated. So I recommend starting with the memory card problem first since it involves just the phone and not the computer. If you fix it, it may also fix the computer problem. (My LG Voyager depends upon a properly working microSD card in order for my phone to communicate with a computer via USB.)
First, have you ever removed the memory card from the phone since you installed it? If you have, and especically if you connect it directly to your computer, then it may have been corrupted or it may have data or folders on it that your phone can't handle and are causing it to error.
Begin by reformatting your SD card. If you have data on it that you cannot afford to lose, then you'll need to copy it with another computer first. When you reformat the card, make sure you do it WITH YOUR PHONE. Don't reformat it with your computer or another device---EVER! If you were successful at reformatting the card with your phone, test it and see if it works again.
If the SD card can't be reformatted, then take your phone to your service provider and have then check it to make sure that the phone is okay and can format and use another SD card. If it can, then your present card is defective and you'll need to replace it.
After your SD card is working (or you've replaced it), then you can move on to troubleshooting the connection with your computer. When you do, you should connect your phone directly to the computer. Do NOT use a USB hub. You need to get the communication working again before you reintroduce additional objects into the path like the USB hub---it could be the problem.
You should work with your service provider for assistance with troubleshooting the communcation. Their support staff should have more experience.
Best regards, WiredNot
I've A Samsung SGH J-700 (slide modle) everything worked fine for the last 6 months since I've had the unit I'm the only owner from the store,in December I bought a 2gig SD card after an month the unit stopped reading the SD card then in January the unit can't connect to/with the software the phone came with,when the phone is pluged into the PC it displays "One of your USB driver is not functioning properly" there are 2 USB ports to the front and 2 USB ports to the back that shows this ,I also have an external 4 port USB hub onto the system when the phone,data cable is connected to any of the the ports "One of your USB driver is not functioning properly" where to get drivers for my problems if that is the problem ,what could be done before I make the phone a UFO
Time of this report: 2/10/2009, 13:27:21
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 3
System Model: KM266A-8237
Processor: Turbo 3400+X Comb Featuring VIG4 Sempron 2200+, MMX,3DNow, ~1.5GHz
Memory: 1536MB RAM DDR1
DirectX Version: DirectX 9.0c (4.09.0000.0904)
Card name: NVIDIA GeForce4 MX 4000
4 port adapter