Tina,
If the HEC-GeoRAS is not showing up in the View --> Toolbars menu, check see if it is listed in the Tools --> Customize --> Toolbars tab.
If it is, check it there--and then should show in the View --> Toolbars.
But if it is also not listed in Customize, then something went amiss with the HEC-GeoRAS install.
My suggestion would be to uninstall and remove all traces of the Water Resource Utilities, and start again.
I've found that with everything cleaned, picking up the ArcHydro9 and AppFramework9 bundled with the HEC-GeoHMS download (either v.5.0.0.69 or v.4.2.93.51) seems to go smoother. I prefer v5.0.0.69 HEC GeoHMS as I think the documentation is better.
Once all three of those are installed, then do the HEC GeoRAS (v.4.3.1.21) install. The ftp site is labled .20 but internaly it is v.21--also use an FTP client rather than your web browser and check the CRC hashes.
Note: HEC-GeoHMS v5.0.0.69 bundles ArcHydro v.1.4.0.255; v4.2.93.51 bundles ArcHydro v.1.4.0.253 which will not work with v.5.0.0.69 of GeoHMS. Not obvious, but need to pay attention to the build/folder dates on the ftp site compared against the ReadmeMMDDYYYY.doc notes. Unfortunately the notes are sometimes a little behind.
Stuart