Crash dumps are enabled but no valid crash dumps have been found. In case you are experiencing system crashes, it may be that crash dumps are prevented from being written out. Check out the following article for possible causes: If crash dumps are not written out.
Read the topic general suggestions for troubleshooting system crashes for more information.
Note that it's not always possible to state with certainty whether a reported driver is responsible for crashing your system or that the root cause is in another module. Nonetheless it's suggested you look for updates for the products that these drivers belong to and regularly visit Windows update or enable automatic updates for Windows. In case a piece of malfunctioning hardware is causing trouble, a search with Google on the bug check errors together with the model name and brand of your computer may help you investigate this further.