I tried changing the usb ports.and did it over and over again but to no avail I went to the BIOS of the Acer, Changed the boot order so that the pendrive is at the top and save &exit. The other day i was wondering ' Y not revive it back by putting windows 10 in it!! so i bought a digital copy (both 32 and 64 bit) and made a bootable USB by putting the iso in a SanDisk 16 USB 3.0 pendrive.
So, i have this age old Acer Aspire 5920 which runs windows 7.