Originally Posted by
abhishek singh21 its unlikely that a virus is at large. Windows 10 is the most secure version to date.
and then there was one, could be a malware too but 1 in-a million. OP please tell us more do you visit lots of unsecure websites ( with unsecure i mean HTTP disabled ) or click on lots of ads and install certain app shown off in an ad?
If you have a virus on windows 7 or 8 and then you upgrade to 10, it could be that the virus is trying to do something over and over in a loop but new security is preventing it. Anything could be possible. It just makes no sense to boot that long no matter how many applications you have. It takes 4 seconds for my pc to get from cold boot to login prompt.
Reset is just the simplest thing for someone who may not want to fuss with things. It also makes sure that the integrity of the OS is correct.
Alternatively:
Check if Disk is full. To update to anniversary update it had to download the files and then install them. It keeps the files in a folder.
Type "Disk cleanup" in the cortana box and clean up files in both regular mode and then the system file mode.
Find errors on drive:
In Dos mode type :
sfc /scannow
Honestly, I did a reset after anniversary update because I wanted to start clean and my PC has been running great.