Recently got a virus and "removed" it but still seeing some weird things


Dec 8, 2015
I did something stupid and got a virus on my computer. Windows defender detected it and removed it and after 3 more scans it stopped finding more viruses. After that I ran malwarebytes and also malwarebytes anti rootkit but like things are not the same for instance windows file explorer would not respond and then respond like a 100 times in a second and is spazzing out. Also google chrome would load some pages glitched a lot more now.(like just blue text but after a refresh its fine.)

Should I do a clean install or have I not found the entire virus yet? Or has it done damage that cant be repaired unless its reinstalled.

I have 2 harddrives if I need to format do I need to format both or just the windows one to be safe