The solution has then cost me several hours and requires additional software which is able to manage all ever installed USB devices (I use the freeware USB deView). If it runs properly, the program displays two connected USB devices. The above-described problem has installed a third (unknown) device. Once that happens is nothing more manually uninstalled the unknown device to be.
After that you can then plug the keyboard back and hope that you will be recognized correctly. In total, there are three ways that this can happen:
1) It is properly recognized (deView shows an associated hub and a connected keyboard to)
2) Nothing happens (deView shows no device connected to)
3) There is reinstalled the third, unknown device.
I have tested the keyboard on two devices (both XP), in both this problem occurs at irregular intervals after a reboot (sometimes after booting from the standby) on. Luckily I need this keyboard only as a makeshift for a partially defective laptop keyboard and can also enter if still needed my password on this. Who wants but use the keyboard Perixx as the sole input device should dispense with a password prompt.
The two star's for good workmanship, because I had already cheap keyboards where the keys fail to respond after a short time, have fallen off or something. Here is the weakest point in relation to the processing that the bright-white lettering faded very quickly, the much used keys "dirty" look.
In addition, the positioning of the Ins + Del keys used to. You are there where else the right Ctrl key or the arrow attached to the left. The arrow keys are for displaced one to the right, the right Ctrl key is missing. This ensteht have the problem that they accidentally come frequently to the Delete key. When will you probably get used to it quickly, but if you use different keyboards daily permanent link to this keyboard, which can be annoying.
A BUY recommendation I can not pronounce because of the recognition problem definitely.
