Little size of windows on taskbar. How to fix it? [closed]

Right click on the taskbar and select Properties. Uncheck the mark near "Use small icons" and click OK. That's all.

If you are talking about the taskbar button widths, you should see the answer to this question.

To undo the resizing of taskbar icons, you can use this VB script. It's safe and simply changes the value of MinWidth in the related registry path. For convenience, I'm copying the script here:

Option Explicit

Dim WSHShell, n, p, itemtype, MyBox

Set WSHShell = WScript.CreateObject("WScript.Shell")
p = "HKEY_CURRENT_USER\Control Panel\Desktop\WindowMetrics\"
p = p & "MinWidth"
itemtype = "REG_SZ"
n = "-2310"

WSHShell.RegWrite p, n, itemtype

MyBox = MsgBox("You must reboot for the changes to take effect.", vbOKOnly,"Done")