Curious- tried using the tablet on another computer to see if the shake is there?

Yeap, it isn't on other computers.
And it's still on this computer when I boot into Linux from a Ubuntu CD :(

Yiiee.. That sure narrows it down! At what point do you end up spending enough to buy an entirely new computer though? :O

Never.. see me in 5 or 4 years, and I might get another new PC. :/

Until then, shaky linework, and plenty of frustrations to fight me drawing :/

have you switched the port that the tablet is plugged into? it could be something as simple as one of the wires for that USB port is going bad.

(sorry - i do field repairs for computers... sort of a reflex action to offer up help like this) ^^;

Alas, still shakes in other ports. Sorry it took me awhile to say so :|

No problem at all, and it's only doing that on this machine... have you reinstaelld drivers for it?

Yeap, but it's the same even in Ubuntu linux, booted from the CD.

ok - in some of the comments you had, you refer to an old and new version of this PC, is it the same hardware but there's a different hardware inside it? and also, is it the same case?

Different everything, except one harddrive is the same.
Wow, could it really be a HARD DISK causing the problem? It's not even my main OS disk..

Is the harddrive the same that was used as the previous primary one?

It was never a primary HD.. :o Though..

ok - you know what, i am gonna note you on this with my AIM and MSN info, might be easier chatting through there.

Lay off the coffee >:(

dammit, I was gonna suggest that! Now I have to do a real one.

If you haven't yet, maybe try a few different USB ports on your computer?

Maybe there's something in your room interfering with the frequency of the pen?

If it was radio interference, it'd interfere with the laptop I place right between my two monitors that works fine :/

I tried different USB ports before I got my motherboard replaced-- EG: I used the ports that are in the back of the PC and are directly on the motherboard.

I'll probably reply to lanhao above when I try another USB port in the back with my new PC. I don't expect it to affect things though :/

what kind of tablet is it?

Wacom Inutous 3. :/

any batteries or any type of power like that? if its being powered by the USB cable then i'd assume it magnetically induces power to your pen/mouse, in such case, theres probably interference on hte tablet itself when near that perticular computer? USB port or power supply could be the cause too

Your computer has a vendetta against Wacom.

Hmm has it been reformatted since you got these problems years ago?

Yeap, and I got a completely different computer for the rest of it.. D: So it's a completely different computer, but still shaky.. sigh.

Oh, I thought it ran ok on other computers. I don't remember the whole deal, obviously! So it's the tablet being broken one must assume :s don't bother replying if this is just the same old tiresome bother to you

Nonono, it's:
The tablet works on every other PC besides:
1. My old version of this PC
2. My new version of this PC

Almost everything's different between this two, though.. 8|