Thank you for the log file. I have a few notes to help keep your system safe ...
As you state you are going to upgrade to Win10, I will not go into all the settings for Win8 / 8.1 but please make sure that Windows Updates are enabled and set to automatic (Windows 10 will actually make this the default and it is kind of difficult to change).
Now some information on programs to help keep you safe:
First, an Antivirus program. You NEED one; free is just as good as paid-for as long as you keep them updated. ONLY use one at a time as having more than that will cause system problems. Here are some free ones to check out:
Microsoft Security Essentials
Avast! Free Antivirus
Next, a firewall is a must have now-a-days. The built in firewall in Windows 7 (or above) is fine (just make sure it is turned on (Start > Control Panel > Windows Firewall)). Or, if you like, you could choose one of the free ones listed here:
Zone Alarm Free Firewall - installer includes foistware so read the options very carefully
Consider a program that will check for out-of-date programs on your system
Some programs don't have update checks built in or make you run the application to start the check for updates process. An easier way to stay on top of the current versions of your installed programs is to use a version checking program like Heimdal Free from Heimdal Security (you can get the software from here and read more about it on the same page).
=== options ====
Unchecky is a small service that runs in the background to help keep those "extra toolbars" and tag along search engines from automatically installing. By automatically directing you to a custom install with all the options unchecked, only what you manually choose and confirm gets installed.
CryptoPrevent is a free program that prevents CryptoLocker / ransomware from infecting your PC by locking down the OS so the malware can not get a grip on your system. You can read the details about this program here.
Also, consider adding MalwareBytes Antimalware to your arsenal of safe keeping programs. Use the free version (not the paid or trial version) and you won't have a problem with your antivirus scanner program. Keep it updated and run a scan with it once a week.
Lastly, if you use Firefox as your main web browser, consider adding the NoScript and AdBlockPlus add-ons to the browser to block scripting hijacks and remove unwanted ads from the pages you view.
You may also find some information and tips at this thread:
How did I get infected in the first place?
COMPUTER SECURITY - a short quide to staying safer online
I'll leave this topic open for a few days so that if you have any questions you can come back here.