Do you have a lot of crap loading with Win? Check your tray for junk you can live w/o and disable. Same with System Configuration/Startup; tell me how many boxes are checked.
1) Run CCleaner and do the Clean and Registry portions both: https://www.piriform.com/CCLEANER
2) Download and run Malware bytes and do a malware scan: https://www.malwarebytes.org/
3) Update your virus program and then run a FULL virus scan.