Everytime I start up my Mac mini I'll be able to use it only for a little while then the beach ball appears and it won't let me do anything I have to keep forcing it to turn off by holding the power button can someone help me?

I have no external devices connected to my Mac mini but still everytime I use it after about half hour to an hour in whatever I'm using wether it's the Internet or iPhoto or iTunes the beach ball appears and I cannot get it to stop I always have to press and hold the power button and force it to switch off I then do a safe reboot and it starts up again fine but same thing again after a certain amount of time it will freeze. I have also had on some occasions a bright white screen with a folder and a flashing question mark appear but it's not because of any external devices as they have all been removed please can someone help me as I have no idea why this keeps happening to my computer and I'm worried that there's something seriously wrong it's only about 6 months old and I have no experience in dealing with computers ??

EtreCheck version: 2.1.8 (121)
Report generated 13 February 2015 15:33:46 GMT
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
Hardware Information: ℹ️
    Mac mini (Late 2012) (Technical Specifications)
    Mac mini - model: Macmini6,1
    1 2.5 GHz Intel Core i5 CPU: 2-core
    4 GB RAM Upgradeable
        BANK 0/DIMM0
            2 GB DDR3 1600 MHz ok
        BANK 1/DIMM0
            2 GB DDR3 1600 MHz ok
    Bluetooth: Good - Handoff/Airdrop2 supported
    Wireless:  en1: 802.11 a/b/g/n
Video Information: ℹ️
    Intel HD Graphics 4000
        LG TV spdisplays_1080p
System Software: ℹ️
    OS X 10.10.2 (14C109) - Time since boot: 0:11:35
Disk Information: ℹ️
    APPLE HDD ST500LM012 disk0 : (500.11 GB)
        EFI (disk0s1) <not mounted> : 210 MB
        Macintosh HD (disk0s2) / : 499.25 GB (398.54 GB free)
        Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
USB Information: ℹ️
    Apple Inc. BRCM20702 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple, Inc. IR Receiver
Thunderbolt Information: ℹ️
    Apple Inc. thunderbolt_bus
Configuration files: ℹ️
    /etc/sysctl.conf - Exists
Gatekeeper: ℹ️
    Mac App Store and identified developers
Kernel Extensions: ℹ️
        /Applications/AVG AntiVirus.app
    [loaded]    com.avg.Antivirus.OnAccess.kext (2015.0 - SDK 10.8) [Click for support]
Launch Agents: ℹ️
    [running]    com.avg.Antivirus.gui.plist [Click for support]
Launch Daemons: ℹ️
    [loaded]    com.adobe.fpsaud.plist [Click for support]
    [running]    com.avg.Antivirus.infosd.plist [Click for support]
    [running]    com.avg.Antivirus.services.plist [Click for support]
User Login Items: ℹ️
    iTunesHelper    Application  (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Internet Plug-ins: ℹ️
    Silverlight: Version: 5.1.30514.0 - SDK 10.6 [Click for support]
    FlashPlayer-10.6: Version: 16.0.0.305 - SDK 10.6 [Click for support]
    Flash Player: Version: 16.0.0.305 - SDK 10.6 [Click for support]
    QuickTime Plugin: Version: 7.7.3
    Default Browser: Version: 600 - SDK 10.10
3rd Party Preference Panes: ℹ️
    Flash Player  [Click for support]
Time Machine: ℹ️
    Time Machine not configured!
Top Processes by CPU: ℹ️
         5%    WindowServer
         1%    AVG
         0%    AppleSpell
         0%    fontd
         0%    cloudpaird
Top Processes by Memory: ℹ️
    215 MB    com.apple.WebKit.WebContent
    125 MB    avgd
    107 MB    Safari
    90 MB    Messages
    69 MB    WindowServer
Virtual Memory Information: ℹ️
    171 MB    Free RAM
    1.68 GB    Active RAM
    1.53 GB    Inactive RAM
    637 MB    Wired RAM
    1.34 GB    Page-ins
    2 MB    Page-outs
Diagnostics Information: ℹ️
    Feb 13, 2015, 03:20:28 PM    Self test - passed
    Feb 6, 2015, 08:08:07 PM    /Library/Logs/DiagnosticReports/Kernel_2015-02-06-200807_[redacted].panic [Click for details]

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