Slow PC and Internet - Virus and Malwarebytes report clean

Wd Scorpio blue 250gb 2.5" hard drive...
June 23, 2013 at 05:13:34
Specs: Windows 7, 2Gb
My PC and Internet has started running slow since about last week. Also, my internet signal will drop completely or drop from 50mb to just 6mb!! The laptop and iPad has fine internet signals and no speed problems.

Bit Defender Virus check comes back clean as does Malwarebytes. System restore is only giving me an option of restoring for 2 days ago. Ive disabled a lot of unnecessary programmes in start up. I'm up to date with Windows updates too.

I don't really want to re-install Windows as i have a 2 year license with my virus protection (Bit Defender).

Any ideas guys?

Specs below:

Operating System
Microsoft Windows 7 Ultimate 64-bit
AMD A8-5600K 70°C
Trinity 32nm Technology
4.00 GB Single-Channel DDR3 @ 804MHz (9-9-10-24)
Generic Non-PnP Monitor (1024x768@60Hz)
AMD Radeon HD 7560D
Hard Drives
932GB Hitachi HDS721010CLA332 ATA Device (SATA) 39 °C
932GB SAMSUNG HD103UJ ATA Device (SATA) 33 °C
Optical Drives
ATAPI iHAS124 B ATA Device
MagicISO Virtual DVD-ROM0000
High Definition Audio Device

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June 23, 2013 at 05:24:12
Thanks for the Specs.

Lets make a start, may have to run many programs, I want to check for infections first, even though you have already tried.

1: Download & run Unhide
A introduction as to what this program does.
For those of you who no longer have the %Temp%\Smtmp folder, you will not be able to use Unhide to restore your Start Menu items. With this in mind, I have created some scripts to restore the default Start Menu for specific versions of Windows that I have access to. You can view the available versions below. I will be adding more as time goes on.
Once the program has been downloaded, double-click on the Unhide.exe icon on your desktop and allow the program to run, it does take some time, be patient. This program will remove the +H, or hidden, attribute from all the files on your hard drives. If there are any files that were purposely hidden by you, you will need to hide them again after this tool is run.
When Unhide is complete, it will create a logfile on the Windows Desktop called Unhide.txt.
Copy & Paste the contents of the log. Let me know if it doesn't produce a log please.

2: Reboot

3: Run ESET Online Scanner, Copy and Paste the contents of the log please. This scan may take a very long while, so please be patient. Maybe start it before going to work or bed.
You may have to download ESET from a good computer, put it on a flash/thumb/pen drive & run it from there, if your comp is unbootable, or won't let you download.
Create a ESET SysRescue CD or USB drive
How do I use my ESET SysRescue CD or USB flash drive to scan and clean my system?
Configure ESET this way & disable your AV.
How to Temporarily Disable your Anti-virus
Why Would I Ever Need an Online Virus Scanner?
I already have an antivirus program installed, isn't that enough?
Once onto a machine, malware can disable antivirus programs, prevent antimalware programs from downloading updates, or prevent a user from running antivirus scans or installing new antivirus software or malware removal tools. At this point even though you are aware the computer is infected, removal is very difficult.
5: Why does the ESET Online Scanner run slowly on my computer?
If you have other antivirus, antispyware or anti-malware programs running on your computer, they may intercept the scan being performed by the ESET Online Scanner and hinder performance. You may wish to disable the real-time protection components of your other security software before running the ESET Online Scanner. Remember to turn them back on after you are finished.
17: How can I view the log file from ESET Online Scanner?
The ESET Online Scanner saves a log file after running, which can be examined or sent in to ESET for further analysis. The path to the log file is "C:\Program Files\EsetOnlineScanner\log.txt". You can view this file by navigating to the directory and double-clicking on it in Windows Explorer, or by copying and pasting the path specification above (including the quotation marks) into the Start ? Run dialog box from the Start Menu on the desktop.
If no threats are found, you will simply see an information window that no threats were found.

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