I don't recall touching sleep settings but let me try this on a Dell Inspiron i15R-2646MRB 15.6-Inch Laptop which came with 7 and had the 10 offer and upgrade.
This may take a while. BBL
First thing I should mention is I haven't had a virus in at least ten years. Those of you that run Windows Defender know that it runs a daily quick scan so maybe no real need to run a full scan. That said, I set WD to run a full scan and went to bed last night. Woke up this morning and saw it had barely moved. First thing I thought of is the 'power options' settings. So I did the usual: Control Panel/power options – power saver – change power settings/put computer to sleep-never / change advanced power settings/change settings that are currently unavailable-Hard disk-Turn off hard disk after – Never – Apply – O.K.
Started another scan, within ten minutes I saw that the power button light is in 'sleep' mode. Let it run for two hours anyway. Scan basically did not run.
Windows 10, Dell computer, all updates. I have run full scans in the past, been several months, and it took a little less than two hours. Do I suspect I have a virus – no. Still that shouldn't prevent me from running a full scan. I have "no" other issues.
Thanks in advance for any suggestions