5 BSOD within 20mins. USBPORT.SYS, CLFS.SYS, ACPI.SYS

Welcome
Sounds like hardware issue. Lets rule out drivers first, to be sure
Driver Verifier
I'd suggest that you first backup your data and then make sure you've got access to another computer so you can contact us if problems arise. Then make a System Restore point (so you can restore the system using the Vista/Windows 7 Startup Repair feature).

In Windows 7 you can make a Startup Repair disk by going to Start....All Programs...Maintenance...Create a System Repair Disc - with Windows Vista you'll have to use your installation disk or the "Repair your computer" option at the top of the Safe Mode menu .

Then, here's the procedure:
- Go to Start and type in "verifier" (without the quotes) and press Enter
- Select "Create custom settings (for code developers)" and click "Next"
- Select "Select individual settings from a full list" and click "Next"
- Select everything EXCEPT FOR "Low Resource Simulation" and click "Next"
- Select "Select driver names from a list" and click "Next"
Then select all drivers NOT provided by Microsoft and click "Next"
- Select "Finish" on the next page.

Reboot the system and wait for it to crash to the Blue Screen. Continue to use your system normally, and if you know what causes the crash, do that repeatedly. The objective here is to get the system to crash because Driver Verifier is stressing the drivers out. If it doesn't crash for you, then let it run for at least 36 hours of continuous operation (an estimate on my part).

If you can't get into Windows because it crashes too soon, try it in Safe Mode.
If you can't get into Safe Mode, try using System Restore from your installation DVD to set the system back to the previous restore point that you created.
Driver Verifier - Enable and Disable

Use the computer for the next 36 hours. Boot it, play your games, do whatever you do with your computer. It should BSOD and this is a good thing. After about 36 hours, send me all the reports.

Your dumps name a MS Kernal driver as the cause. NO way, its just the scapegoat. This may very well mean hardware. Start with a memory test.
Guide to using Memtest86+ - Geeks to Go Forums
Run fo 8 passes
Then take each stick and test for 6 passes in a good slot.

For 8 passes run with all the sticks, just like the computer is now
Then run each stick separately in a good slot for 6 passes.

You will either get pass, or fail with a number (amount of failures) Even one failure you either need new ram or a new MB.