I don't know of a way to repair / rebuild a RAID0 array when one disk has errors. BUT maybe there is something like that. What you really need is the instruction manual for the RAID system you have. It may be a file on the CD of utilities that came with your system or mobo. If you know the chipset on your mobo (particularly the Southbridge that provides the software RAID management), you may be able to get the manual either from the mobo manufacturer's website or from the chip manufacturer's website. The manual ought to tell you if there is some repair process you can use on a RAID0 array with a detected error.
If there is no such procedure, make VERY sure you have a complete backup that can be restored.
Then your best bet will be to delete the array so that each HDD is now a stand-alone disk. The info on them will be useless. BEFORE you do that, IF your machine can still run, download from the WD website (I see the disks you have say WDC...) their diagnostic package. Get the Data Lifeguard for DOS version, either the CD version here :
http://support.wdc.com/product/download.asp?groupid=502&sid=30&lang=en
or the floppy disk version if you have a floppy drive. Follow the instructions to burn your own bootable diagnostic testing disk. IF your machine cannot do this because of its problems, use another machine to get and make your diagnostic disk.
Now you can go ahead and Delete the RAID0 array and start to work on the individual HDD units. You put your diagnostic disk on its drive and boot from it. Completely independent of Windows (you don't have any OS on your HDD now) it will load a mini-DOS into RAM and you can run all its test from menus. You can test one disk unit at a time. If it finds any problem write down what it says, because WD Tech Support will want those details. If it says it can fix the problem, try that - you can't destroy your data any more than it is! One tool that can help if there are a few bad sectors is the Zero Fill process which takes a very long time. It does a thorough test of the drive and can replace malfunctioning sectors with spare good ones.
If you can get both drives to test out trouble-free this way, you can safely re-start your machine and use the RAID Management screens to re-Create your RAID0 array. Then you can use your backup dataset to Restore all of it to the repaired array. On the other hand, if one of those drives had a big problem you cannot fix, you can replace it and then re-Create your RAID0 array and Restore to it.