Normal Suggestions: 1. De-clutter your computer. I.E. Uninstall all trial software, run anti-virus and anti-malware scans, defragment, etc.
2. Run a ChkDsk (Start > "cmd" > Right Click > Run as Admin > "chkdsk"
3. Run SFC / SCANNOW (Start > "cmd" > Right Click > Run as Admin > "sfc / scannow"
4. Open Explorer > Organize > Folder & Search Options > View > Advanced Settings > check 'Launch folder windows in a separate process' > Apply > OK
5. Get rid of any third party explorer extensions/shells. (Download
this program. It should allow you to do that.)
Odd Suggestions: 1. Disable Preview Pane in Explorer
2. Disable UAC
3. Disable DEP (Start > "cmd" > Right Click > Run as Admin > "bcdedit.exe /set {current} nx AlwaysOff"