Download, install, update and run a Full Scan with Malwarebytes: Malwarebytes
Study the Event Viewer>Custom>Admin view for repeat errors to google text and ID# for resolution. Check also the Performance log on Advanced Tools page accessed by clicking your WEI score link at Computer>Properties. Check for cued issues at top of Tools page, Generate A System Health Report.
Type "Solutions" in Start Search box to see if any have been sent for Problems reported or not. Always report problems when asked as Windows 7 is interactive this way.
Test your hardware by running memtest86 CD for 5-6 passes or overnight: RAM - Test with Memtest86+
then test the HD using maker's diag/repair full CD scan: Hard Drive Diagnostics Tools and Utilities (Storage) - TACKtech Corp.
Check temps for overheating by installing SpeedFan, blow dust out of the case using canned air, check all connections carefully avoiding static discharge to components by touching case first, reseat RAM.
Try a Clean Boot Procedure
to learn what programs are running unseen which can be causing problems. Turn off all Startup items except AV and gadgets: Startup Programs - Change
Some of these steps suggested for cleaning up or clean reinstalling a factory bloatware install
Run SFC /SCANNOW Command - System File Checker
to repair any damaged or corrupt OS files.
As a last resort before running Factory Recovery partition/disks or clean reinstall try a Repair Install
which can fix most problems as it reinstalls the OS while keeping all programs, files and settings in place. Tips for a clean reinstall
, which is actually better than getting a new computer with today's bloated factory pre-installs.