I don't know what the problem is... Or should I say, your previous problems.
Less than 30 seconds to boot up, never had a virus - EVER! Only malware I have had was from a crack that was on a CD to get Nero to work.
As for a defragmentation program, you didn't use windows own one did you? Did you use their firewall as well?
I can defrag my main C drive in less than a minute & have it close packed on an NTFS system with zero fragments... Unlike the standard windoze defragger that would say it didn't need anything doing
I guess you just stuck with what you were given, I know I'd get fed up with that to...
Nothing at all wrong with a windows based machine, just don't use half of the windows cobblers programs that are already there, install better ones.
Jobs a good one