hi Uka,
u didn't tell which Solidworks Version u r using.
pls follow these steps,
Tools-Options-Document Properties-Units-
here below the Linear Units - Select Decimal Option (instead of Fraction option)
here u can change ur current units types also like mm, cm, inches, feets etc..
i think this will solve ur problem.
thanks,
regards,
Murugan.S
Design Engineer,
GlobalSoft Pvt Ltd,
New Delhi, INDIA.
murugan_subham@yahoo.com