$500 via Verizon e-gift card (sent w/in 8 wks). Activation of 4G LTE/5G phone on 5G Get More plan req’d. Device must remain active for 45 days. $500 charge back if service cancelled w/in 12 mos or eligibility req’s are no longer met. See vzw.com/bring-your-own-device for details.
I would download and install all three, make sure to update them before using, and then run them only one at a time, and be patient. Your PC may be infected (that's why it may be running slow) or you may not have enough processing power for whatever reason.
You should also update and run your antivirus software.
If you don't have one on your machine, then try downloading one.
People will have various suggestions, Verizon Offers a good one from Mcafee for 5.99 a month and it covers 3 PC's. If you have that and still have a virus after running it, they may be able to help you remove it over the phone.
If you don't feel like paying for one, then you should try one of the free choices out there. the big difference is that if it doesn't fix it, then you don't have a lot of options for people to call for free over the phone help, you're pretty much on your own with the free ones.
Here are some suggestions for that. (don't download multiple antivirus's, pick and choose one - install/update/scan)