Defrag
look on your labs
Windows support can be found at the Microsoft support site. Geek Squad also provides support for various computer needs not limited to Windows. The latter option you do have to pay for.
Windows SIM
PowerShell, VBScript, Scheduled Tasks... there are lots.
Windows XP, Windows Vista, and Windows 7 will support Microsoft 2010.
Windows 98, Windows 2000, and Windows XP all support USB
Windows 95 OSR 2.1 was the first Microsoft OS to support USB, although Windows 98 offers much improved USB support. Besides Windows 95 with the USB update and Windows 98, Windows 2000 and Windows XP support Original USB, but Windows NT does not. Windows XP, with the service packs applied support Hi-Speed USB support. Resource: CompTIA A+ Guide to Managing and Maintaining Your PC. Pg. 404
No
DishnetPC does indeed support Windows Vista. It also supports Apple's iOS, Windows 7, Windows XP and Windows 8.0 and 8.1.
Windows 95 OSR 2.1 was the first Microsoft OS to support USB, although Windows 98 offers much improved USB support. Besides Windows 95 with the USB update, and Windows 98, Windows 2000 and Windows XP support Original USB, but Windows NT does not. Windows XP with service packs applied, supports Hi-Speed USB.
Windows Support Tools was created on 2003-04-24.
Ad-Aware 2007 and later do not support Windows 98.