Well there r couple of steps to troubleshoot......
U Should check ur ram one by one to see their is any error \ fault in ur mem stick indivisualy or u may temporarily change ur ram if possible & u also checking ur bios settings too.
If there r no fault in ur mem stick then u should check ur softwares to see r they corrupt ?
If not solveved, check systems wid couple of good updated antivirus prog & anti spyware prog. After that if u hv no luck then u should reformat ur OS drive & load fresh OS & softwares.
Hopefuly all d tricks may solve ur issue.