weird stuff going on

So here i am, asking for help. I have an ASUS ROG G74S series.

My computer has been doing some very awkward things. including but not limited to:

*often will not connect to internet and when it does when switching pages it says server issues.
*runs terribly slow
*disk drive acting up, some times has power and runs but not read disks.
*Rondomly switches applications on its own.

I have ran antivrus from day one, and even switched between and apparently no virus' found.

Any help would be great.

thank you

Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 7 Home Premium, Service Pack 1, 64 bit
Processor: Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz, Intel64 Family 6 Model 42 Stepping 7
Processor Count: 8
RAM: 16361 Mb
Graphics Card: NVIDIA GeForce GTX 560M, -1024 Mb
Hard Drives: C: Total - 127025 MB, Free - 47217 MB; D: Total - 715401 MB, Free - 688992 MB;
Motherboard: ASUSTeK Computer Inc., G74Sx
Antivirus: AVG AntiVirus 2014, Updated and Enabled