Error while logging in B1

Hi when i am logging in to SAP b1 some times it gives the error and B1 automatically shutdowns.

This the error description

Exception code: C0000005 ACCESS_VIOLATION

Fault address: 01A4CEE0 0001:0164BEE0 C:\Program Files\SAP\SAP Business One\SAP Business One.exe

I am using SAP business one 2005Band SP00 with PL35.

Thanks in advance

Praveen