Hi Amit, I too used
Spybot Search & Destroy on my older XP system. It found cookies I'd remove after an over long scan process.
After joining MT, both Staff & members recommended (2) effective secondary scanners. They perform well beyond the abilities of the old faithful Spybot on a newer system such as Windows 8.1.
malwarebytes
http://www.malwarebytes.org/downloads/ & HitmanPro
http://www.surfright.nl/en/hitmanpro
The latter, HitmanPro, found over 300 cookies & other items both Avira Free AV & Spybot could not; & after breathing new life into my old slower system, it became much faster!
As mentioned above, prepare in event any changes affect functionality of your system as something important can sometimes be removed as a result of "cleaning". Do some type of backup first.
Finally, CCleaner is a free software that removes cookies, temp files, and lots of other "junk" quickly, & safely enough to use daily. Read about, & download it safely here
http://www.softpedia.com/get/Security/Secure-cleaning/CCleaner.shtml
Note: There is a portable version available, you'd place on an external flash drive, if you'd like to keep your system clear. On the site you'll see the word
portable. Good luck, & thanks for sharing your configuration!