Irfanview

Irfanview is a graphics viewer. It supports all the major formats and is freeware for Windows. It can basically do everyhing you need it to do from a graphics viewer and one of the most recommended. Nice thing about this?
1 EXE file.
No DLLs to worry about, no shareware or registration nag. You want to donate? Donate at the site. Enjoy.
Via Irfanview