First, a Mea Culpa. I'm coming into this not following the stated procedures. If i'm in the wrong forum, let me know. I'm technical enough to get almost all the issues I see fixed except this one and I need help.
It's my neighbor's Windows 7SP1 laptop. He's been too aggressive installing freeware, not running his anti-malware products and keeping Java and Flash up to date. The Tuvaro/www_searchnow hijack was installed a couple of weeks ago. This is the first indication my neighbor had he was infected. Except for a short period, (less than a day) I have been unable to remove it. The system was slow on startups and shutdowns.That has improved dramatically after running Malwarebytes. Internet Explorer (now the only browser installed) performance at coming up is now very slow.
Two other problems presented itself at the same time:
1. The Firefox web browser, after updating to version 29, keeps launching the "Welcome to Firefox" web page (a well-documented bug that sometimes occurs). Attempts to access the add-ons page were redirected.I was unable to edit the Firefox preferences file (permissions issue-not the file itself). Internet Explorer keeps showing the "Set as default browser dialog box" even after being selected. Resetting both browers failed to solve the problem.
2. Flash will not update (crashes the browser) and I had a devil of a time getting Java to update (but it is now). Initial attempts to just read the Java install logs were prevented by file permission issues.
I've used numerous tools in both regular and safe modes. Malwarebytes (removed over 3,000 PUP's), Spybot, Superanti-spyware, ADW cleaner, TDSKiller, Kaspersky VRT, and RogueKiller. I have logs of pretty much everything I did. I've also done a SFC check and that reports no Windows integrity issue.
I also have a full system image backup.
The only non-pups I noted were the autokms.exe Trojan, not-a-virus:Adware.Win32.Lyckriks.b, not-a-virus:adware.Win32.agent.ajsd.
Because I'm new to this forum and I've not followed the rules, I'm not sure how/where to proceed from here.