Hey guys so my laptop has two hard drives, hard drive c and d. Normally, I have about plenty of space in both drives but suddenly today when opening my laptop windows asks me to run disk cleanup because i have low space on on hard drive C. I was shocked to find out i only had 47mb left of free space. So I ran this app called TreeSize Free to check what was hogging most of the space and found this file called pagefile.sys and it was 156gb of size. So what do I do now? Can i just delete it?