Crystl32.ocx registration problem

Hi There,
I have made a software using vb/sql server/crystal reports 7. Reports r made in Crystal Reports Designer, to display report frm VB I am using Crystl32.ocx component.

The problem is crystl32.ocx is unable to register. Whenever I try to register it executing - REGSVR32 "D:\REPORTS\Cyrstl32.ocx" -

I get the following error
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- LoadLibrary (D:\REPORTS\Crystl32.ocx) failed.
Get last error returns 0x00000485.
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The temp solution I thought was to do Minimum Installation of Crystal Reports on client machine. I know this is a wrong way but couldnt help it. Can anyone help me out of this problem?

Why I am getting above mentioned error while registering crystl32.ocx?
Is there need to register any other files?

Help will be appriciated