Both the GarenaPlus and mpr.dll may be difficult issues, even relating to viruses and stuff, especially the latter one. Depending on what security programs you have, they may block these - which is a sound factor. I run Avast Internet Security, and I'm always happy when it goes *bing* and reports it has stopped something. Just like I'm happy when my German Shepard barks on the yard, reporting he put off some bastards...
I would recommend you to try and test those programs thoroughly, with the security program you have, and one or more online scanners.