I have an idea, you may need a new driver for your card reader. I would go to the manufacturers website (if they have one) and see if they have a Windows 7 driver. You may also try unplugging the card reader (it's probably plugged into a USB port on the motherboard. Try a different one. You may also restart the computer if you have not tried that. Sometimes it will re-detect the hardware. Good luck.
My Computer
Computer Manufacturer/Model Number
Keeps changing - (Custom)
OS
Windows 7 Professional x64
CPU
Intel Core i7 860
Motherboard
Gigabyte GA-P55-UD4P
Memory
4GB DDR3 Mushkin 1600Mhz @ 7-8-7-20
Graphics Card(s)
MSI GTS250 1GB DDR3 Twin Frozr
Sound Card
Onboard realtek
Monitor(s) Displays
Samsung SyncMaster 24" P2450 + Samsung 20" 2033
Screen Resolution
1920 X 1080 and 1600 X 900 (#2 system 1440 X 900)
Hard Drives
Patriot Inferno 120GB SSD + 3 WD Blue 640GB drives
PSU
Corsair 750 HX Modular
Case
Lancool PC-K62
Cooling
Cooler Master TX3 CPU cooler and 4-140mm and 1-120mm case
Keyboard
Gigabyte USB keyboard
Mouse
Microsoft wireless laser mouse 5000
Internet Speed
7 Mb down 1.5 up
Other Info
System #2: AMD Phenom II X6 1055T (Freezer 7 Pro cooler) - Gigabyte 880GMA-UD2H - WD 500GB Black - 9500GT (1GB) 500W OCZ modular PSU - Antec 200 case. System #3 (LapTop) Core 2 Duo T6670 - 320GB 7200RPM HD - 4GB DDR3 RAM.
Let me know if you get if figured out man, Maybe someone else can help too.
Some of those card readers are......let's say "easily replaceable" you may need to spend $15 and get a new one. I have a feeling it's something hardware or driver related.
My Computer
Computer Manufacturer/Model Number
Keeps changing - (Custom)
OS
Windows 7 Professional x64
CPU
Intel Core i7 860
Motherboard
Gigabyte GA-P55-UD4P
Memory
4GB DDR3 Mushkin 1600Mhz @ 7-8-7-20
Graphics Card(s)
MSI GTS250 1GB DDR3 Twin Frozr
Sound Card
Onboard realtek
Monitor(s) Displays
Samsung SyncMaster 24" P2450 + Samsung 20" 2033
Screen Resolution
1920 X 1080 and 1600 X 900 (#2 system 1440 X 900)
Hard Drives
Patriot Inferno 120GB SSD + 3 WD Blue 640GB drives
PSU
Corsair 750 HX Modular
Case
Lancool PC-K62
Cooling
Cooler Master TX3 CPU cooler and 4-140mm and 1-120mm case
Keyboard
Gigabyte USB keyboard
Mouse
Microsoft wireless laser mouse 5000
Internet Speed
7 Mb down 1.5 up
Other Info
System #2: AMD Phenom II X6 1055T (Freezer 7 Pro cooler) - Gigabyte 880GMA-UD2H - WD 500GB Black - 9500GT (1GB) 500W OCZ modular PSU - Antec 200 case. System #3 (LapTop) Core 2 Duo T6670 - 320GB 7200RPM HD - 4GB DDR3 RAM.