XP PC not printing from MS word

I guess the easiest answer is to uninstall/reinstall office.

Another thing you might try before that is starting word from the run command like this:winword /a /m

Then open your document and try it again.

Is Word the only program that this is happening in?

Can you print any document from this computer at all?

I would first be looking at the printer driver and network setting on this unit before starting to remove programs in the faint hope of curing your problem.

As the printer is not visible sometimes you could also look at the actual network configuration as well it is always possible that you have a faulty lead or bad connection along the line. At one place where I did some work I was nearly driven mad with a similar type of problem with one particular computer only being able to access the network sometimes and not others. Eventually after much mucking around it turned out to be a building extension that had been added and a trapped cable that had been snagged by a tiger bolt when the office in the workshop had been added. They bolted a length of wood to a concrete wall and attached it with tiger bolts and one caught the CAT5 lead and was causing it to short out on an irregular basis..

If this is a wireless connection check for a constant connectivity as well. It's always possible that you have a marginal connection which is causing the problem.

Col