That probably means that the memory is OK (the forum recommendation here is for 8 passes - but I consider that to be overkill
The next check needs to be the hard drive - which in fact you already ran.
Please open Event Viewer, and look for the Windows Logs - Application
In the Source column, look for Wininit events - the latest one is likely to be the output from your CHKDSK run.
Please double-click on that, then use the Copy button, and paste the results into your reply.