Problems with Removable drives (thumb drivers/DVD-ROM, everything)

Hey guys, I'm so frustrated right now! These problems have been occurring since a month. I can't read any DVDs/CDs via DVD-ROM. My computer won't pick up any external-HDD, USB flash drives, nothing. This has been pissing me off since a month and I finally considered of reinstalling the Windows and I did just now, BUT THE PROBLEMS ARE STILL THERE?

Computer doesn't reads removable storages devices. Sometimes, they wouldn't even show up. The DVD-ROM says that 'please insert disk" while it's in there.
I've Windows 7 32-bit, which I just installed at the moment.
I guess it's a hardware problem but not exactly sure. Would you guys help? All these dvds/cds/flash-drivers/external-hdds are fine and work with my other systems.

Please help me out, I'm done with this.

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