[Fixed] Foxit reader leaves registry keys after running

Hi,
I found some registry keys of Foxit Reader left in HKLM after running:

(1) HKLM\SOFTWARE\Classes\Applications\Foxit Reader.exe
(2) HKLM\SOFTWARE\Classes\PDFPreviewHandlerHost.FoxitPDFPreview.1
(3) HKLM\SOFTWARE\Classes\PDFPreviewHandlerHost.FoxitPDFPreviewHa

I am using it on WinXP SP3, an administrator account. Please help to see if these keys can be removed. Thanks.