Kaspersky had that space in my Desktop in the very beginning.
Browsing torrents - it did all the advanced disinfection after-work
Games from friends' USB drives - it did the cleaning of 1000s of malware
Once, it wiped clean my partner's USB, just before he was gonna make the presentation for the Graduation ceremony!
But after a year, I choose to go for the tempting freeware.
Used 360 TS for a few months but left it because of the False Positives.
Here's the story - The last freeware setup was Avira+Comodo Firewall+MBAE.
Once I noticed a suspicious account named 'wpnccnngcse' that used to get activated on my PC alongside my admin account.
Everytime I deleted it, it came back! That horror when you have an unidentified account on your PC again & again, and I still remember that weird account name :-/
Also, there were some anomalies while granting rights too. Disc usage abnormally high and no suspicious registries detected.
Once I tried entering that account out of curiosity, it turned to a black screen and a strange logo at the bottom.
Wiped clean my PC then.
My new lappy is leading a happy life with KIS + Crystal Security + MCShield + MBAE and sandboxie, accompanied with some good 2nd opinion toys :-D