computer has not been running games that well lately what should i do?

[UrBoi_DirtyBoi]

computer specs- OS Name Microsoft Windows 7 Home Premium Version 6.1.7601 Service Pack 1 Build 7601 Other OS Description Not Available OS Manufacturer Microsoft Corporation System Name PHAT System Manufacturer Hewlett-Packard System Model p7-1231 System Type x64-based PC Processor Intel(R) Core(TM) i5-2320 CPU @ 3.00GHz, 3001 Mhz, 4 Core(s), 4 Logical Processor(s) BIOS Version/Date AMI 7.16, 10/5/2011 SMBIOS Version 2.6 Windows Directory C:\Windows System Directory C:\Windows\system32 Boot Device \Device\HarddiskVolume1 Locale United States Hardware Abstraction Layer Version = "6.1.7601.24384" User Name Time Zone Eastern Daylight Time Installed Physical Memory (RAM) 8.00 GB Total Physical Memory 7.91 GB Available Physical Memory 4.43 GB Total Virtual Memory 15.8 GB Available Virtual Memory 11.8 GB Page File Space 7.91 GB Page File C:\pagefile.sys------------------------------------------------------------------------------------------------------------------------------------------

 

 

my computer has not been running games that well lately and i dont know what to do. the  ram usage has been above 50% for a few months and it used to be down around 15% what would be causing this? i already cleared temp file and it didnt help.