Many users have expressed discontent with their computer. It is running slow. You're finding popups everywhere. Something is wrong. Its taking 20 minutes to boot.
Here's what I recommend for most systems that have been in use for over a year, but have never had any IT maintenance performed...
antivirus
defrag
developer tools
disk scan
eset
indexing options
kaspersky
maintenance
malware
malwarebytes
optimization
performance
registry cleaner
safe mode
slow boot
superantispyware
trojanremover
user recommendations
windows 7
windows vista