Yes, but you need to acknowledge that you will lose all your data if even just ONE drive dies.
Having said that...
As an Administrator, right-click on Computer, and select Manage. On the left side, open up Disk Management. Once that loads, you can right-click on the hard drive itself (not the part with the drive letter), and click 'Convert to Dynamic Disk'. On your system drive, you'll need to reboot the machine.
After you have two dynamic disks, and some free space on both drives, you can create a volume, and choose to make it Striped. Right-click on the Unallocated Space of one drive, choose 'New Striped Volume' and follow the wizard.
I have not seen the System Volume (where Windows is installed to) on a Software RAID 0, but that's not to say you can't do it. I haven't tried, so I cannot comment on that.