Do you reckon it's plausible that the issue is being caused by lack of USB drivers?
doubtful, win7 should be able to work with those legacy usb ports out of the gate.
what was the reasoning for re-install of the OS? did you format the hdd?
have you checked the hdd for errors?
everything during re-install go smoothly? what mode you got the sata controller in? ide, ahci, raid?
please list full specs, cpu, psu, vga, ram, etc.
my main rig...
asrock 970 extreme3
AMD athlonII X3 440
zalman cpns5x performa hs/fan
crucial ballistix 2x4gb sport ddr3-1333
powercolor ax7750 1GBK3-H vga
antec neo he 650r
Samsung 840 EVo SSD 120 GB
toshiba 2TB HDD 64M cache sata3
seagate 1TB HDD 64M cache sata3
hitachi 2TB HDD 64M cache sata3
lg wh14ns40 bd burner
optiarc ad-7240s sata dvdrw (nec chipset)