I'm not an expert, so this question is really basic. Is it possible for a virus or malware to hide in place that affects anything you type in, or download, or run, and ultimately keep you from finding it? I hope I worded that well enough to make sense. I'm not sure what info to give, but I have a laptop running Windows 7. I think I have tried every possible program I could find, and nothing major seems to come up. I've been working at this for weeks, and maybe now I'm just seeing things where there is nothing wrong.
A few weeks back, I definitely downloaded something that my computer didn't like. I worked every program to get rid of it, and maybe I did. It's possible in my attempt to remove things manually and randomly that seemed to be part of the problem, I may have just created operating issues, that feel like there is still a virus or malware, but it's simply missing or broken operating files now. I can't really tell the difference. I have dozens of log files accumulated now and it's like reading a foreign language for me, but I scan through looking for stuff that may jump out at me. I've never reached out for online help, but I need to find the problem or stop worrying about it, so here I am. I guess I'm looking for information, in hopes that there's something I haven't tried yet. My apologies to experts for my amateur entry.
Programs I tried:
Microsoft Malicious Software Removal
Malware Bytes with Chameleon and Anti root killer
emsisoft emergency kit
Panda virus scan 2.0
Anyway, I'm sure there are that I'm forgetting at the moment. It would seem from my list that it is impossible that there is anything hiding after all that. Yet after I start using my computer normally, it may take an hour or so but eventually it starts acting weird. Web pages freeze and messages pop up, looking for updates I've done already, or scrip errors looking to be fixed, or transferring data and suddenly I'm back in safemode and scanning again. I've obviously created a problem I don't know how to fix now. I guess what I'm wondering is, could there be a virus or malware that hides in such a way that it infects each of those programs as I download them and then hides where they can't find it?
I appreciate any advice or information people could share. Thank you.