Well As force said It seems like it's a Windows issue, You clearly have a modified theme, that could have caused it, it could have just been a random windows spaz. It wouldn't be the first time windows had done something wrong.
My Win7 Machine reports that winRar is 2GB. it's not it's just Windows spazzed when I installed it.
Regards Orpheus.
Btw, as a added tip, Don't post a screenshot showing what Antivirus +/firewall and OS you're running on a public forum.