Error When Installing/Uninstalling

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Hi everyone! I just registered here but I have an annoying problem that prevents me from playing SHIV. So I tried to install the 1.4 patch but there was an error when I installed it. It was something to the effect of it not being compatible or something like that. Well anyway, I tried to uninstall it, but then it wouldn't let me do that. So I tried to just delete the Silent hunter folder but now it seems to think it's still installed and I get this error trying to uninstall it:

Error Code: -5006 : 0x8000ffff
Error Information:
>SetupNew\SetupDLL.cpp (814)
PAPP:Silent Hunter 4 Wolves of the Pacific
PVENDOR:Ubisoft (http://www.Ubisoft.com)
PGUID:0D005F09-A5F4-473B-A901-5735C6AF5628
$12.0.0.49985
@Windows (9200) BT_OTHER 840.99

And this when I try to install it:

Error Code: -5006 : 0x8000ffff
Error Information:
>SetupNew\SetupDLL.cpp (814)
PAPP:Silent Hunter 4 Wolves of the Pacific
PVENDOR:Ubisoft (http://www.Ubisoft.com)
PGUID:0D005F09-A5F4-473B-A901-5735C6AF5628
$12.0.0.58849
@Windows (9200) BT_OTHER 840.89

I'm not very computer savvy so I realize I probably did something horribly wrong and stupid but if anyone knows how to fix this I'd be thankful because I literally cannot find ANYTHING about it on Google. Thanks