I use the Windows XP regularly for my business and except for an occasional BSOD it has been working pretty well. I use the Windows 7 seldom but something in it seems to be corrupt or a virus or something. Started about a week ago when trying to install a software program and got a message something like 'unable to install because a hardware device on your system is not functioning properly'. Sorry, I did not write down the exact wording. When I googled the message, most things I found suggested some sort of virus. I ran all the scans I could think of for viruses and nothing came up. I did get that same message ('unable to install because a hardware device on your system is not functioning properly') when I tried to run Malwarebytes but was ultimately able to run Malwarebytes with a clean install. Also got that same message when trying to run some other updates. None of the scans I ran showed any viruses, even a boot scan in Avast.
Since then, I really have not been on Windows 7 until today when I logged into it. Everything seemed to be OK. Installed some updates, then tried to update Adobe Reader. After the update downloaded I hit the install button and the screen just went blank for a second then the install button popped back up. After a few times of that I decided to try to do a clean install of Adobe Reader. When I tried to un-install the older version of Adobe reader, a message came up that I did not have permission to uninstall it (even though I have administrative rights). I then logged into my Administrator account, tried to uninstall it from there. It said I could not because the other account was still open. I logged off of the Administrator Account, logged into my regular account, then logged off of my regular account and the screen went blank. Tried to reboot. All I got was a black screen with a white cursor arrow. Tried to reboot into safe mode. The screen came up for me to log into safe mode, but when I tried to log into safe mode, it showed all the different things installing, but then I only got the black screen with the white arrow again. After several tries, I came onto here.
I'm sorry for the long description of my situation. Hopefully I can get the Windows 7 part of the computer repaired without doing any damage to my XP install, which is why I came here before trying anything else.