I believe this to be a Microsoft Windows error but I was wondering if anybody on here had encounterd this and was able to fix this annoyance. I am running WinXP. When I Drag and drop excel cells it gives me this error. I have also received it when inserting parts into an assembly using the insert part button. In SW I will get it 2 or 3 times in a row when trying to insert parts but it will eventually insert the part. Any Ideas would be great! Thanks.