Malware bytes picked up guiminer-scrypt, which was downloaded from mirror 2 in this thread
https://bitcointalk.org/index.php?topic=150331.0

Hitman Pro has picked up cgminer-fpgaonly.exe and cgminer.exe from the same download.

Are these false positives?

I'm gutted $700 is a lot of money for me.

Am I missing out on something?

I was connected with a CAT 6e cable directly to my router and was getting 1800kh/s litecoin, now i get 1700 or less with a wireless adapter.  Does the network connection affect the hash speed? Thanks!