USB flash drive/ DVD drive problem

Hello guys
I recently ran into a very weird windows 7 bit problem after installing it on my desktop. I cannot copy large files/ holders into usb flash drive or write large files to cd/ dvd. The copying/ moving process would stay on for about 5-10 seconds then freezes then I get an error message. That is:
H: refers to a location that is unavailable. it could be on a hard drive on this computer...
I have all the latest drivers.
And windows/ nero 9 can't use my dvd drive to burn files.
Some info about my system: AMD X4 630 CPU. MSI KA780G (AMD 780G chipset) mobo. I have 2 sata hdds, non raid mode. The DVD drive is IDE. 4gb ram ddr2 ram. windows 7 64 bit.
Any help would be appreciated, thanks.

Did you do an in place Upgrade or clean install?

Where did you get your Win7?

it's a full clean install. i got the disk from the school that i go to.

Well you can look for critical errors in Event Viewer, and Google repeat errors to try to troubleshoot.

Run sfc /scannow to check system files.

Click through your WEI score link in Computer>Properties to Advanced Tools and check Performance Logs, Generate a System Health Report.

If you've sent a report to MS, type problems in start box and view Solutions.

The last step before Clean Reinstall is Repair Install

i've installed it so many times, problem still exists. when i install on my two laptops, the problem doesn't occur.
edit: doing sfc /scannow as we speak

Test your memory with Windows Memory Diagnostics. Then burn to CD Memtest86 and stress test memory overnight, or at least 6 passes.

Fill in your system specs in link at bottom left of your post to get more help.

Find your HD diagostics on the Support Downloads page for your model HD. Burn to CD and do full scan.

What drive is actually Drive H in explorer?
have you tried changing the Drive letters?

Just a thought:
This error can occur if you change a drive letter (such as changing the DVD Drive From E to F for example) and the burning app still thinks its at the old location.

It can also happen if your trying to copy a folder with a shortcut inside (for example pointing to Drive H) that does not exist in the current configuration. therefore the OS does not know where to find it and generates that error.

drive H is the flash drive. and no i havent tried changing the drive name, i'm running the windows memory dianostric tool atm. on your 2nd point, the problem here is that some files will get copy over, then the process will freeze and then i get that error message. thanks for the help so far guys, really appreciate it.

This is likely a hardware problem with all of your reinstalls not helping.

But if you do another reinstall, this time wipe the HD with DBAN.

lol whatever it is how could i fix it , there's gotta be a way. memory test is going, fine so far. also a note: after the error message pops up, the flash drive still shows up in my computer, however i'm unable to access it. windows is also unable to display free/ used space of the flash drive.