My computer has been doing a wide range of strange behaviors since reinstalling about two months ago. For one, I system restore function doesn't work. Task Manager usually takes quite a few hits to start up. Some of my programs suddenly start acting up, malfunction. I've been in touch with the software tech support for one of my most important programs and they can't find any reason why I'm having problems with their product. I've tried reinstalling it, too. Just today I tried to create a PDF file with Corel Fusion (legal, paid for version) and it won't create the PDF. I tried uninstalling the program to install an updated version and I can't uninstall it through Control Panel/Programs and Features. I've had failures in installing software. Recently I've had freezes/slowness resizing photos in my photo editing program. I checked usage and the reason for this is the procedure maxes out my RAM. I only have 4GB but as I said, I've never had these sorts of problems before...and this slowness just started up suddenly a short while back. I've been using this program for decades on various computers and never had this problem. I've been using this program with no issues on this computer for a few years.
My AV (Webroot) and MalwareBytes finds nothing.
I don't want to waste time trying to find malware. I have a copy of Windows 7 in a partition on my hard drive. However, I would rather reinstall from a different source, like Microsoft. I have a legal Windows number. Is there a way to reinstall directly from Microsoft?
I checked in Device Manager and there aren't any yellow question marks.
This afternoon I ran diskchk. What I really want is to make sure these problems aren't caused by my computer. Running Diskchck didn't give me a report, so I don't know if it found any issues.
How do I make sure my computer is functioning properly?