APC_INDEX_MISMATCH (0x1)
This is a kernel internal error. The most common reason to see this bugcheck is when a filesystem or a driver has a mismatched number of calls to disable and re-enable APCs.
One of the common causes of these errors is memory errors. If your RAM has a marginal component or is overclocked or the voltage is low, you're likely to get random errors 0x0 or 0x1. Please download memtest from techspot's download section and run it for 8 passes to rule out this possibility.
Just as a side note, please ensure that your system is configured to have appropriate virtual memory. You can check that out by right clicking on my computer, going to advance tab, then to performance settings, and advance in performance options. Regards