Depending on how you update. If it's a bound form, it shouldn't give errors. If you update through dynamic sql, it will. If you're using DAO:
[tt]"update sometable set somefield = """ & me!txtBox & """"[/tt]
Only short snippet to demonstrate the concept of doublequoting, which works in DAO for special characters
As stated by ZmrAbdulla, it is hard to guess if we do not know what and how you are doing stuff, so unless you post more details, we're only guessing...
Have a look at faq181-2886, in relation to this, perhaps in particular #14, but the whole faq is worth a read;-)
Roy-Vidar