Diff.between "available" and "free" physical memory?

You're crowding it pretty hard.

Go to the Resource Monitor from its button in Task Manager and post a screen shot of the memory tab showing the colored bars at the bottom of the window. You may have a considerable amount of memory devoted to hardware reserved.

You might be a good candidate for an upgrade to 64 bit and 8 gb of RAM, but it's hard to say that you would necessarily notice the difference. Is anything annoyingly slow with just 4 GB?
 

My Computer My Computer

At a glance

Windows 7 Home Premium SP1, 64-bitIntel Skylake i5-6600K, not overclocked8 GB HyperX DDR4-2666 (2 x 4 GB)none; graphics are integrated on CPU
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Ignatz Special; 4 speed manual gearbox; factory air conditioning; one of one
OS
Windows 7 Home Premium SP1, 64-bit
CPU
Intel Skylake i5-6600K, not overclocked
Motherboard
AsRock Z170M Extreme 4, micro ATX
Memory
8 GB HyperX DDR4-2666 (2 x 4 GB)
Graphics Card(s)
none; graphics are integrated on CPU
Sound Card
onboard: Realtek ALC1150; external: USB Behringer UF0-202
Monitor(s) Displays
Dell S2340M 23 inch IPS
Screen Resolution
1600 x 900
Hard Drives
System: Crucial MX100 series SSD, 128 GB;
Data: Samsung Spinpoint 103SJ, 1 TB;
Backup: WD Caviar Green WD30EZRX-00D8PB0, 3 TB
PSU
Rosewill SilentNight 500 watt fanless, semi-modular
Case
Antec Solo II
Cooling
Noctua NH-U12S; Noctua F12 intake, Noctua S12A exhaust
Keyboard
Microsoft 200 6JH-00001 USB
Mouse
Dell or Microsoft optical wired; USB
Antivirus
Microsoft Security Essentials and Malwarebytes Premium
Browser
Pale Moon
Other Info
All fans PWM; speeds at idle: CPU circa 500 rpm; intake circa 600 rpm; exhaust circa 600 rpm; CPU temps 27 idle and 47 C load in a warm room (27 C/81 F) when running Intel Extreme Tuning Utility stress test.
herewith resource monitor

Is it Slow?, not so bad today. Not beset with slow running scripts today, dont know why. I'm using this machine as an example to educate myself (and maybe others), there are a couple of laptops Tosh R600 3G fitted which are often worse. I don't notice huge paging delays like you used to get years ago with XP/2K but I think that's partly at least because Win 7 memory management is more sophisticated (and of course because everyone has at least 3G fitted)
 

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My Computer My Computer

At a glance

w7 pro 64bit8G
Computer type
PC/Desktop
Computer Manufacturer/Model Number
dell t3400
OS
w7 pro 64bit
Memory
8G
Screen Resolution
1920 1080
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