The Verizon UM175 installation supports WinXP, WinVista, and Win7 (and you're certainly running one of these three), so the only possible problem you might be having is that you may be running Windows XP, but you're running a Service Pack level that is no longer supported. Most software packages require WinXP to have at least Service Pack 2 installed, and many installations are now requiring WinXP to have at a minimum Service Pack 3.
To determine what Service Pack you're running:
START > Control Panel > System > General (tab)
Microsoft offers "Service Packs", consisting of (free) packages of updates and bug fixes for its operating systems, which are released riddled with bugs, omissions and security holes.
To install the Windows XP service packs that may be needed to allow the Verizon UM175 modem-related software installation to proceed, visit Microsoft at:
http://support.microsoft.com/kb/322389This Microsoft Knowledge Base article mentions Service Packs 1, 1a, 2, and 3, but there is also a 4th.
Windows Vista also has service packs (there are two). If you're running WinVista, the Verizon software may require both. For these Service Packs, visit Microsoft at:
http://support.microsoft.com/kb/935791
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