Have same issue:
Cannot close w3.exe and have problems with closing Win7 (it takes ages and don't go to end):
Seagate Barracuda ST1000DM003 (3.5", 1TB, 64MB, SATA/600)
MSI GeForce GTX 660 OC Gaming 2GB DDR5 PCI-E BOX
Corsair DDR3 2x4096MB 1600MHz CL9.0 XMP Vengeance LP
MSI B85-G43 Gaming
Intel Core i5-4570 3.2GHz BOX
Microsoft Windows 7 Home Premium 64-bit PL DVD LCP OEM
Zalman Z9 Plus