There are many possible reasons for this. Rather than ask a dozen different questions regarding your system, would you be willing to download and run a little utility that may help point to a cause?
If so read the following:
Apple Support Communities contributor etresoft wrote a very useful app to quickly gather certain system information that may help point to a cause of this problem. Go to his website, download and run EtreCheck:
Don't be concerned about anything that says "Problem" or "failed".
Copy and paste its output in a reply.
Etrecheck was designed to remove any personal information (such as your computer's name and serial numbers) but if you see anything that looks like an email address or any other personal information that should not be divulged to others, please delete or obscure that information when you post the reply.
When you are finished with EtreCheck, quit the program. It occupies very little space, and you can keep it or drag it to the Trash as you wish.
MacBook Pro - model: MacBookPro8,2
1 2.2 GHz Intel Core i7 CPU: 4 cores
4 GB RAM
OS X 10.8.2 (12C60) - Uptime: 0 days 1:17
TOSHIBA MK5065GSXF disk0 : (500.11 GB)
disk0s1 (disk0s1) <not mounted>: 209.7 MB
Macintosh HD (disk0s2) /: 499.25 GB (424.92 GB free)
Recovery HD (disk0s3) <not mounted>: 650 MB
HL-DT-ST DVDRW GS31N
Apple Inc. BRCM2070 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Inc. Apple Internal Keyboard / Trackpad
Apple Inc. FaceTime HD Camera (Built-in)
Apple Computer, Inc. IR Receiver
Problem System Launch Daemons:
Problem System Launch Agents:
User Launch Agents:
User Login Items:
Sony Ericsson Bridge Helper
3rd Party Preference Panes:
User Internet Plug-ins:
Google Earth Web Plug-in.plugin
14.6 % WindowServer
6.9 % coreaudiod
6.4 % uTorrent
1.9 % WebProcess
1.4 % iTunes
1.2 % EtreCheck
0.5 % fontd
0.2 % NotificationCenter
0.1 % Dock
0.0 % Microsoft
Read the following and create a new, "temporary" user account. Log out of your existing account, and log in to the temporary one. See if the behaviour changes while using the "temporary" one:
Creating a temporary account to isolate user-specific problems: Isolating an issue by using another user account
Be certain to log out of your normal account (or restart your Mac) before logging in to the temporary one.
hey...can i reset my whole mac?
As in erase it completely, and start over? Yes, that is certainly an option, and if you do not want to devote the time to fixing what is wrong it may be the most expeditious one. That is up to you to decide.
Torrents are an invitation for malware as ~Bee wrote, and you are using two torrent clients (BitTorrent and uTorrent). It is nearly certain that this resulted in something that must be eradicated, the only question is what it is and how to get rid of it.